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PubMed1977

Use of drugs in ointment for routine mydriasis.

The mydriatic effect produced by ointment preparations of cyclopentolate 1%, tropicamide 1%, and phenylephrine hydrochloride 10% was compared to the mydriasis elicited by the aqueous solutions of the same concentrations of drugs in children and adults. There was no difference in the amount of mydriasis produced by one instillation of a very small volume of the drug in ointment in one eye when compared to multiple instillations of the aqueous solution of the same drug in the contralateral eye in 30 minutes. There were no complaints of ocular irritation when the ointment preparations were instilled into the eye; however, there were frequent complaints with the use of these drugs in aqueous solutions.

Adolescent↗
PubMed1997

Submicrometer precision biometry of the anterior segment of the human eye.

PURPOSE: To demonstrate the feasibility of measuring the anterior structures of the human eye by partial coherence interferometry and to determine its precision for eyes under normal and cycloplegic conditions. METHODS: The dual-beam version of partial coherence interferometry, a recently developed noninvasive optical ranging technique, enables high resolution measurements of several intraocular distances with unprecedented precision. A modified, more sensitive scanning version of this technique was used to assess the central and peripheral corneal thickness, the anterior chamber depth, and the lens thickness of 20 healthy, emmetropic to moderately myopic eyes. Furthermore the anterior structures of three eyes were measured under cycloplegia (1% cyclopentolate) to investigate the influence on the precision of this technique after suppression of residual accommodations. RESULTS: The mean geometric precision (standard deviation) of the measurement of the central corneal thickness was 0.29 micron (range, 0.22 micron to 0.38 micron) and 0.43 micron (range, 0.27 micron to 0.56 micron) for the peripheral corneal thickness at a distance 2 mm from its apex. The precision for measuring the anterior chamber depth and the lens thickness for fixation at infinity was 8.7 microns (range, 3.9 microns to 16.8 microns) and 8.9 microns (rang, 2.9 microns to 14.4 microns) for noncycloplegic eyes and 1.9 microns (range, 1.7 microns to 2 microns) and 1.4 microns (range, 0.7 micron to 1.8 microns) for cycloplegic eyes, respectively. CONCLUSIONS: The dual-beam partial coherence interferometry enables fast, noninvasive, submicrometer precision biometry of the anterior segment of the eye. The precision of determining the anterior chamber depth and the lens thickness is more than one order of magnitude better than that of the currently used ultrasound and optical techniques, and it can be improved by a factor of 5 by using cycloplegia.

Adult↗
PubMed2006

The impact of modest prematurity on visual function at age 6 years: findings from a population-based study.

OBJECTIVE: To determine the effects of modest low birth weight and prematurity on visual function of children predominantly aged 6 years. METHODS: Children with a birth weight of 1500 to 2499 g were considered exposed to a modest low birth weight (n = 82) and were compared with children with a birth weight of 2500 g or more (n = 1386). Exposure to modest prematurity, 32 to 36 weeks' gestation (n = 115), was similarly analyzed and compared with birth at term, 37 or more weeks' gestation (n = 1446). Logarithm of the minimum angle of resolution visual acuity was measured in both eyes. Cycloplegic autorefraction (cyclopentolate), cover testing, and dilated fundus examinations were performed. RESULTS: A modest low birth weight increased the risk of amblyopia (relative risk [RR], 5.1; 95% confidence interval [CI], 2.2-12.0), strabismus (RR, 3.7; 95% CI, 1.5-9.1), and anisometropia (RR, 3.7; 95% CI, 1.2-11.1), together with an increased risk of uncorrected visual acuity in the lowest quartile (RR, 1.7; 95% CI, 1.3-2.2). Modest prematurity increased the risk of amblyopia (RR, 4.5; 95% CI, 1.9-10.6), strabismus (RR, 2.6; 95% CI, 1.1-6.0), and uncorrected visual acuity in the lowest quartile (RR, 1.5; 95% CI, 1.1-2.0). CONCLUSION: Modest degrees of low birth weight and prematurity may be associated with increased ophthalmic morbidity at age 6 years.

Amblyopia↗
PubMed1992

Anteroposterior shift in rigid and soft implants supported by the intraocular capsular bag.

We compared the depth of the anterior chamber and the optimal distance refraction in a group of patients with soft and rigid intraocular implants under pilocarpine (maximal ciliary contraction) and cyclopentolate (maximal ciliary relaxation) in order to determine if lens movement might account for the apparent accommodation phenomenon. Lens shifts ranging from 1.5 to 0.02 mm and refractive variations up to 1 D were found. However, the discrepancies between amount of shift and refractive variations suggest that lens movement does not play a relevant role in this phenomenon.

Accommodation, Ocular↗
PubMed2005

Changes in astigmatism in children with congenital nystagmus.

BACKGROUND: Astigmatism is commonly reported in children with and without nystagmus. In children less than 4 years of age the astigmatism changes from against the rule (ATR) to with the rule (WTR) astigmatism in children without nystagmus. However, little is known about children with congenital nystagmus. We compared astigmatism in children with congenital nystagmus below 4 years and above 4 years of age. MATERIAL AND METHODS: Three hundred and fifty-six eyes in 178 children who satisfied the study criteria were included. The children were divided into those below 4 years of age (n of eyes = 192) and those above (n of eyes = 164). Cycloplegic refraction (with manual retinoscopy) carried out at presentation and at the last follow-up were recorded and compared. Cycloplegia was achieved using cyclopentolate eye drops. Outcome of eyes with no astigmatism at initial presentation was compared with the final refraction in both the age groups. The visual acuity at the first presentation was compared with the visual acuity at the last presentation. RESULTS: Average follow-up duration was 3.36+/-1.59 years. On presentation, 176 (49.44%) eyes did not have any astigmatism. We found that 26 (25.2%) out of the 103 children below 4 years of age who did not have any astigmatism on presentation developed WTR astigmatism after a mean follow-up of 3.5+/-1.5 years. (p= 0.042). In children >or=4 years of age only 7 (9.6%) children out of 73 developed WTR after a mean follow-up of 3.4+/-1.4 years. The visual acuity change was not found to be significant in the two groups. The majority (90.3%) improved or had same visual acuity in group A and 88.9% improved or had the same visual acuity in group B at the last follow-up (p= 0.77). DISCUSSION: Our incidence of WTR astigmatism in children with congenital nystagmus is similar to those previously reported series. Our data suggest that there is a significant chance that children under 4 years with congenital nystagmus may develop WTR astigmatism compared with children above 4 years of age. CONCLUSION: With the rule (WTR) astigmatism is common in children with nystagmus. Children under 4 years of age presenting with no astigmatism may acquire WTR astigmatism as they grow. The amount of astigmatism increases with age in children with nystagmus. Visual acuity, however, remains stable as the age advances.

Astigmatism↗
PubMed1981

Cycloplegic refractions of premature infants.

Cyclopentolate refractions of 146 premature infants disclosed higher incidences of myopia and anisometropia than those reported for full-term infants. Also, more than 70% of the premature infants had I diopter or more of astigmatism; 83% of the astigmatism was against-the-rule. Infants with shorter gestational periods had more severe myopia and astigmatism. Infants born very prematurely should undergo follow-up refractions to determine whether they retain refractive errors large enough to interfere with visual function.

Age Factors↗
PubMed2004

Angioedema related to the use of hyaluronidase in cataract surgery.

PURPOSE: To report a series of cases of angioedema related to the use of hyaluronidase in cataract surgery. DESIGN: Observational case series. METHODS: Three eyes of three patients who had periorbital angioedema after phacoemulsification at the Mayo Clinic, Rochester, Minnesota, between April 2001 and May 2002 were retrospectively skin tested for allergies using the prick technique. RESULTS: Skin testing was positive in all three patients for allergy to hyaluronidase (150 U/cc) and histamine control; and negative for prick control, 2% lidocaine, 1% cyclopentolate, 2.5% neosynephrine, 0.5% proparacaine, 0.3% ofloxacin, and thimerosal. CONCLUSIONS: The use of hyaluronidase in ophthalmic anesthesia injection may cause immediate type hypersensitivity reactions such as angioedema.

Angioedema↗
PubMed2005

Effect of (+) or (-) camphorsulfonic acid additives to the mobile phase on enantioseparations of some basic drugs on a Chiralcel OD column.

This paper describes the modification of Chiralcel OD column properties by adsorption of (+) or (-) camphorsulfonic acids (CSAs) used as additives to the mobile phase. The effects on retention, selectivity and efficiency, of adsorption of (+) and (-) CSAs on a Chiralcel OD column were examined. Racemic anti-histamines, anti-malarial and anti-fungal drugs, namely doxylamine, miconazole, sulconazole, hydroxyzine, homochlorcyclizine, methoxypheniramine, cyclopentolate and ephedrine were investigated as chiral tested compounds. All the studied drugs have an amino nitrogen atom in their structure. Only the enantioseparation of ephedrine enantiomers with CSAs alone was studied on the Nucleosil stationary phase, and these results were compared with the results obtained on the Chiralcel OD phase. A new dynamically generated stationary phase, with very good enantioseparation ability towards the studied compounds, was obtained by the adsorption of (-) CSA on the Chiralcel OD column.

Benzoin↗
PubMed2005

Patterns of spectacle use in young Australian school children: findings from a population-based study.

PURPOSE: To describe the patterns of spectacle use in a population-based sample of Australian Year 1 school children (mostly aged 6 years). METHODS: Logarithm of the minimum angle of resolution (logMAR) visual acuity was measured in both eyes before and after pinhole correction, and using spectacles if worn. Cycloplegic autorefraction (cyclopentolate) and detailed dilated fundus examination were performed. Visual impairment was defined as visual acuity <40 logMAR letters (ie, <20/40 Snellen equivalent). Myopia was defined as spherical equivalent (SE) refraction < or = -0.50 diopters (D), and hyperopia as SE refraction > or = +2.0D, deemed significant when > or = +3.0D. Astigmatism was defined as cylinder > or =1.0D and anisometropia as SE refraction difference between the two eyes at least 1.0D. RESULTS: One thousand seven hundred forty predominantly 6-year-old school children were examined during 2003 to 2004. Spectacle use was documented in 77 children (4.4% of sample). Uncorrected visual impairment was found in the worse eye of 71 children (4.1%) and refractive error accounted for the majority (69.0%). Astigmatism was the most common refractive error causing visual impairment, accounting for 46.5%. Hyperopia, with or without astigmatism, was the most frequent reason for spectacle use, documented in 40.3%. Spectacle use in the absence of significant refractive error, amblyogenic risk factors, or visual impairment was noted in 26 children (33.8% of spectacle wearers). The prescription of spectacles could have benefited a further 26 children (1.5% of sample), mostly for correction of astigmatism. CONCLUSION: This study documents a significant disparity between spectacle use and need. Astigmatism was the most common cause of visual impairment due to refractive error.

Child↗
PubMed2006

Analysis of patients with good uncorrected distance and near vision after monofocal intraocular lens implantation.

PURPOSE: To analyze factors contributing to uncorrected visual acuity of at least 6/12 for distance and at least J4 for near (pseudoaccommodation) after monofocal intraocular lens (IOL) implantation. SETTING: Iladevi Cataract and IOL Research Center, Ahmedabad, India. METHODS: In a case-controlled study of 30 eyes (30 patients) that had phacoemulsification, those with pseudoaccommodation were assigned to cases and 30 eyes (30 patients) without pseudoaccommodation were designated as controls. Controls were matched by identical best corrected visual acuity, age, and postoperative duration. Subjective refraction was done with retinoscopy. Factors analyzed included corneal astigmatism, pupil size, axial IOL movement, amplitude of accommodation, axial length (AL), and age. Corneal astigmatism was noted on topography and interpreted as against the rule (ATR) (180 +/- 15 degrees), with the rule (WTR) (90 +/- 15 degrees), and oblique (OB) (45/135 +/- 30 degrees). Pupil size was noted on topographic display and AL and anterior chamber depth (ACD) on immersion A-scan. The axial IOL movement was calculated as the difference in ACD after instillation of cyclopentolate 1% (Cyclopent) and subsequently pilocarpine nitrate 2% (Carpinol) at separate visits, and amplitude of accommodation was measured with static and dynamic retinoscopy. Multivariate logistic regression and odds ratio with 95% confidence intervals were determined. RESULTS: Mean spherical equivalent was -0.45 +/- 0.63 diopter (D) in cases and -0.35 +/- 0.83 D (P = .61) in controls. Multivariate logistic regression in cases versus controls: corneal astigmatism (ATR versus WTR and OB collectively): 10.19 [1.8,57.44], P = .009; pupil size: 0.45 [0.07,2.71], P = .38; axial IOL movement: 1.39 [0.51,0.77], P = .514; amplitude of accommodation: 2.95 [0.93,9.3], P = .065; AL: 0.55 [0.29,1.02], P = .058; and age: 0.98 [0.5,1.95], P = .963. CONCLUSION: The study suggests a significant role of ATR corneal astigmatism in good uncorrected distance and near vision after monofocal IOL implantation.

Accommodation, Ocular↗
PubMed2005

Quantitative determination of pharmaceuticals using nano-electrospray ionization mass spectrometry after reversed phase mini-solid phase extraction.

The pre-concentration effect of solid phase microextraction (SPE) with nano-electrospray ionization mass spectrometry (nano-ESI MS) for selected pharmaceuticals is presented. An analytical method is developed for the quantitative determination of dicyclomine in serum with cyclopentolate as the internal standard by off-line nano-ESI ion-trap MS with reversed phase mini-SPE. Homemade C18 and C4 mini-SPE cartridges of 0.5 and 1cm in length and 1.55 mm i.d. have been tested for pre-concentration of samples originally 30 microL in volume. After SPE, the volume of the sample in methanol is about 1-2 microL and 0.5 microL can be injected into the nano-ESI MS instrument. Use of a 1cm C18 cartridge lowered the detection limit of dicyclomine 100 times to 16.1 fmole. Dicyclomine spiked in serum can be determined by nano-ESI MS after protein precipitation and further clean-up on the 1cm C18 cartridge. However, the slope of a calibration curve of dicyclomine standards spiked in serum is more than a factor of 10 less than that for a calibration curve of dicyclomine standards prepared in water indicating pre-concentration of pharmaceuticals could be compromised by a complex biological matrix.

Animals↗
PubMed2005

Visual acuity and the causes of visual loss in a population-based sample of 6-year-old Australian children.

PURPOSE: To describe the distribution of visual acuity and causes of visual loss in a representative sample of Australian schoolchildren. DESIGN: Population-based cross-sectional study. PARTICIPANTS: One thousand seven hundred thirty-eight predominantly 6-year old children examined during 2003 to 2004. METHODS: Logarithm of the minimum angle of resolution (logMAR) visual acuity was measured in both eyes before and after pinhole correction and with spectacles if worn. Cycloplegic autorefraction (cyclopentolate) and detailed dilated fundus examination were performed. MAIN OUTCOME MEASURES: Visual impairment was defined as any (visual acuity <20/40; <40 letters) or severe (visual acuity < or =20/200; 0-5 letters) for both better and worse eyes. Myopia was defined as spherical equivalent (SE) refraction < or =-0.50 diopters (D), and hyperopia as SE refraction > or =+2.0 D, deemed significant when > or =+3.0 D. Astigmatism was defined as cylinder > or =1.0 D and anisometropia as SE refraction difference between eyes at least 1.0 D. Amblyopia was defined as corrected visual acuity <0.3 logMAR units (<20/40; <40 letters) in the affected eye not attributable to any underlying structural abnormality of the eye or visual pathway, together with a 2-logMAR line difference between the eyes and presence of an amblyogenic risk factor. RESULTS: The mean visual acuity of this sample was 20/25 (49.3 letters). Uncorrected visual impairment was found in the better eye of 23 children (1.3%) and in the worse eye of 71 children (4.1%). The prevalence was higher in girls than boys and among children of lower socioeconomic status. Refractive error was the most frequent cause, accounting for 69.0%, followed by amblyopia (22.5%). Astigmatism was the principle refractive error causing visual impairment and was frequently uncorrected. Presenting visual impairment (using current glasses if worn) was found in the better and worse eyes of 15 children (0.9%) and 54 children (2.8%), respectively. This was mainly due to under corrected or uncorrected refractive error. CONCLUSIONS: This study has documented a relatively low prevalence of visual impairment in a population of Australian children. Uncorrected astigmatism and amblyopia were the most frequent causes.

Child↗
PubMed2006

Refractive error and patterns of spectacle use in 12-year-old Australian children.

PURPOSE: To document the prevalence of visual impairment resulting from refractive error and to describe patterns of spectacle use in a representative sample of 12-year-old Australian school children. DESIGN: Population-based cross-sectional study. PARTICIPANTS: Two thousand three hundred fifty-three predominantly 12-year-old children examined from 2004 through 2005. METHODS: Logarithm of the minimum angle of resolution (logMAR) visual acuity (VA) was measured unaided and with spectacles if worn. Subjective refraction, cycloplegic autorefraction (with cyclopentolate), and detailed dilated fundus examination were performed. MAIN OUTCOME MEASURES: Myopia was defined as spherical equivalent (SE) refraction < or =-0.50 diopters (D), hyperopia as SE refraction > or =2.0 D, and astigmatism as cylinder > or =1.0 D. Uncorrected visual impairment was defined using unaided VA, and presenting visual impairment was defined using spectacle-corrected VA, if worn. Visual impairment was defined as VA <20/40 (<40 logMAR letters) for both better and worse eyes. Spectacle need was defined as uncorrected visual impairment in the better eye, improving by at least 2 lines with refraction, and undercorrection as presenting impairment in the better eye, improving by at least 2 lines with refraction. RESULTS: Uncorrected and presenting visual impairment in at least 1 eye because of refractive error was found in 10.4% and 3.7%, respectively. Spectacle use was reported by 448 children (19.0%); 204 (46.3%) had myopia, 48 (10.9%) had hyperopia, and 96 (21.8%) had astigmatism in at least 1 eye; 38.3% had no significant refractive error in either eye. Eight children were in need of spectacles and 37 children (8.3% of spectacle users) were undercorrected. Nonrefractive spectacle users were more likely to report eyestrain and headache or to have had learning difficulty at school (P<0.0001). CONCLUSIONS: This study documents a relatively low prevalence of undercorrected refractive error in a population of Australian children. Nonrefractive prescription of spectacles is common.

Adolescent↗
PubMed1991

The effect of preoperative flurbiprofen on miosis produced by acetylcholine during cataract surgery.

Sustained pupillary dilation during cataract surgery may be achieved with preoperative noncorticosteroidal anti-inflammatory agents such as flurbiprofen. However, these agents may interfere with miosis after injection of acetylcholine. Thirty patients for extracapsular cataract extraction were randomly assigned in a double-masked fashion to receive either a placebo or preoperative 0.03% flurbiprofen every 30 minutes for four doses. All patients also received three doses of 2.5% phenylephrine and 2% cyclopentolate. Pupillary diameter was measured the day before surgery, immediately before the surgical incision, immediately before and five minutes after acetylcholine injection, and the morning after surgery. The flurbiprofen group had a larger mean pupillary diameter before injection of acetylcholine (P less than .001), five minutes after acetylcholine (P less than .001), and on the first postoperative day (P less than .005).

Acetylcholine↗
PubMedDate not supplied

Effect of decreased retinal illumination on frequency doubling technology.

PURPOSE: To investigate the effect of changes in retinal illumination on Frequency Doubling Technology (FDT). METHODS: Five eyes, of 5 adults who were free from identifiable ocular pathology, were examined using the Snellen chart and the Pelli-Robson chart, conventional automated perimetry, and the full threshold N-30 program of FDT. Each test was performed with and without a 0.9, 1.5, or 2.4 log unit neutral-density (ND) filter placed before the eye. Furthermore, the influence of pupil diameter on FDT test results was compared after treatment with pilocarpine or cyclopentolate with the influence of ND filters. RESULTS: All tests showed a decrease in sensitivity with decreasing retinal illumination. Frequency Doubling Technology showed an especially pronounced and significant decrease in sensitivity. The maximum mean threshold difference in FDT results with ND filter was 31.2 dB while that with the Humphrey Field Analyzer and the Pelli-Robson chart were 13.3 dB and 0.66 log contrast, respectively. The mydriatic state of the pupil increased the sensitivity of FDT and the miotic state decreased it to about the same extent as the the 0.9 ND filter. CONCLUSION: The change in retinal illumination has more impact on FDT than on spatial contrast tests and conventional automated perimetry. It is important to take this into account in evaluating FDT results.

Adaptation, Ocular↗
PubMed1982

The relation of myopia and astigmatism in developing eyes.

The relation of astigmatism and myopia was analyzed in 298 myopic children, ages birth to 10 years. The mean spherical equivalent, determined by cyclopentolate retinoscopy, for the entire group was--2.9 diopters and did not change significantly with age. However, in 3-year-old children and younger, myopia progressed in eyes with greater than or equal to 1 diopter of cylinder and tended to increase through age 8 years in those having greater than or equal to 3 diopters of cylinder. Also, astigmatic errors greater than or equal to 1 diopter, especially of oblique orientation, were associated with higher degrees of myopia than nonastigmatic errors. These data from myopic children suggest that uncorrected astigmatism during a period of visual immaturity influences the course of myopia. Thus, naturally occurring astigmatic errors, that are frequent among infants and young children, appear to have a role similar to the vision blurring perturbations that trigger the development of myopia in young animals. Ascertainment and full correction of these refractive errors in young children may be important in assuring the best possible vision.

Age Factors↗
PubMed1989

The effect of treatment with topical nonsteroidal anti-inflammatory drugs with and without intraoperative epinephrine on the maintenance of mydriasis during cataract surgery.

The author conducted a six-group, randomized, clinical trial to compare the relative efficacies of use of preoperative topical Ocufen (flurbiprofen), or Indocid (indomethacin, Indocin), with and without concurrent intraoperative epinephrine treatment; epinephrine treatment alone; and placebo in maintaining surgical mydriasis produced by preoperative administration of phenylephrine and cyclopentolate before cataract intraocular lens (IOL) surgery. Two hundred sixteen cases were randomized to receive one of the six treatment combinations. The treatment groups not receiving epinephrine (placebo, Indocid, Ocufen) had average percent decreases in pupil diameter of 19 to 24%, whereas groups receiving epinephrine (with or without Ocufen or Indocid), had decreases of only 0.8 to 2.6%. The effect of epinephrine treatment was significant (P less than 0.0001), regardless of nonsteroidal anti-inflammatory drug (NSAID) treatment. Indocin patients (without epinephrine) had less miosis than placebo patients; the proportion of cases with large decreases in pupil diameter (greater than or equal to 2 mm) was reduced by approximately 50%. Ocufen had an additive effect with epinephrine; the group with Ocufen + epinephrine treatment had a smaller proportion of cases with pupil size decreases than the group with epinephrine alone.

Administration, Topical↗
PubMed2003

Prednisolone and flurbiprofen drops to maintain mydriasis during phacoemulsification cataract surgery.

PURPOSE: To compare the effects on the pupil of pretreatment with prednisolone 1% eyedrops, flurbiprofen 0.03% eyedrops, and sodium chloride 0.9% eyedrops in patients having phacoemulsification cataract surgery. SETTING: Christopher Home Eye Unit, Royal Albert Edward Infirmary, Wigan, United Kingdom. METHODS: One hundred thirty-six white patients having phacoemulsification with no history of eye disease, antiinflammatory medication, or diabetes were enrolled in this prospective randomized double-blind study. Patients were allocated to receive flurbiprofen 0.03%, prednisolone 1%, or sodium chloride 0.9% (placebo) eyedrops at 30-minute intervals beginning 2 hours before surgery. All patients received cyclopentolate 1% and phenylephrine 2.5% drops preoperatively and epinephrine 1:10(6) intraoperatively in the intraocular irrigating solution. The pupil diameter was measured from a television screen at the preset magnification of the operating microscope immediately before the incision, at the end of nucleus emulsification, at the end of irrigation/aspiration (I/A), and at the end of surgery. One hundred twelve patients with a baseline pupil diameter of at least 6.0 mm who had uneventful phacoemulsification were analyzed. RESULTS: The baseline pupil diameters were statistically similar. An analysis of variance did not reveal an overall significant mydriasis-maintaining effect of prednisolone or flurbiprofen compared to the placebo at any stage of surgery (P =.16 to.37). The 95% confidence interval showed flurbiprofen to be superior to prednisolone at the end of surgery. According to the paired t test, the reduction from the baseline at the end of I/A in the prednisolone group (P =.051) and at the end of surgery in the flurbiprofen group (P =.22) was not significant. CONCLUSION: In the presence of epinephrine in the intraocular irrigating solution, both prednisolone 1% and flurbiprofen 0.03% failed to maintain mydriasis at the crucial steps of nuclear emulsification and cortical I/A.

Aged↗