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At least 37 records · Page 2Linked to original sources

Near retinoscopy in accommodative esotropia.

We tested whether near retinoscopy, a noncycloplegic retinoscopic technique, was applicable to the optic correction of patients with accommodative esodeviations. We performed a study in 17 patients with accommodative esotropia to compare the refractive values obtained by near retinoscopy and by cycloplegia, as measured by two examiners. The interobserver variability was the same for the two techniques for the refractive values of the horizontal and vertical meridia and spherical equivalent. For the astigmatism, there was greater variability for near retinoscopy. The correlation between the two methods was good, but the variability of the differences was high. We recommend that near retinoscopy should be employed only as a noninvasive method for screening refractive errors in children.

Accommodation, Ocular↗

Retinoscopy after excimer laser photorefractive treatments.

Photorefractive keratectomy (PRK) is capable of changing the refractive power of the human cornea. Retinoscopy is an objective method of measuring the refractive power of the eye. The authors performed PRK in 28 myopic eyes with the Aesculap Meditec MEL 60 ArF excimer laser. During a prospective study, the subjective and objective refractive power of the eyes were assessed and compared 6 months after PRK. The average preoperative refractive error was: -5.11 +/- 2.51 D and -5.08 +/- 2.20 D on the right side (n = 16) and on the left side (n = 12), respectively. In order to obtain the best corrected visual acuity 6 months after PRK, the right and left eyes needed an average of -0.09 +/- 0.26 D and -0.33 +/- 0.64 D postoperative correction, respectively. The postoperative refractive change could be verified with the retinoscopy at +/-0.5 D accuracy. The authors describe a double refractive corneal ring after PRK, which may disturb retinoscopy. The post-PRK refractive change can be verified by retinoscopy. Postoperative funduscopy, fundus photography and possible future retinal procedures were not disturbed by the double corneal refractive rings in myopic eyes.

Adolescent↗

Accuracy of intraoperative retinoscopy in corneal power and axial length estimation using a high plus soft contact lens.

AIM: To assess the accuracy of intraoperative retinoscopy with high plus soft contact lens (CL) in estimating corneal power and the axial length compared with standard keratometry and biometry measurement. METHODS: Intraoperative retinoscopy was performed in 30 eyes prior to the implantation of an intraocular lens (IOL). A +10 D disposable soft contact lens was applied on the cornea to minimize retinoscopic error. Corneal power was derived from refraction using biometric axial length while the axial length was derived using keratometric measurement. Refraction derived corneal powers and axial lengths from 26 eyes within +/-1.00 D of the target postoperative refraction were compared with preoperative standard keratometry and biometry measurements. RESULTS: In the 26 eyes, the mean difference between the corneal powers derived from refraction and keratometry was 0.35 D (S.D.=1.678). The 95% limits of agreement were -3.006 to +3.706. The mean difference between the axial lengths derived from refraction and biometry was 0.15 mm (S.D.=0.721). The 95% limits of agreement were -1.292 to 1.542. CONCLUSION: Intraoperative retinoscopy with a high plus soft contact lens after phacoemulsification is useful but not accurate in estimating corneal power or axial length of the eye. It should be used cautiously in IOL power calculation as a substitute for standard keratometry or biometry machines when either of these is not available or in error.

Aged↗

Value of transesophageal echocardiography, esophago-gastroduodenoscopy and retinoscopy prior to intra-arterial fibrinolytic therapy in patients with peripheral arterial disease.

BACKGROUND: We prospectively investigated the need for esophagogastroduodenoscopy (EGD), transesophageal echocardiography (TEE) and retinoscopy for pre-interventional screening in patients with peripheral arterial occlusive disease (PAD) prior to intraarterial fibrinolytic therapy. PATIENTS AND METHODS: 212 consecutive patients suffering from PAD (164 male and 48 female, mean age: 64 +/- 11 years, 161 patients stage II of Fontaine's classification, 10 patients at stage III and 41 patients at stage IV) referred for interventional treatment were included. 173 EGDs, 169 TEEs and 188 retinoscopies were performed within one week prior to fibrinolysis. 114 patients had all three examinations. RESULTS: Pathologic findings were detected in 56 (49%) of the 114 patients: 23 erosions, 12 ulcers, 2 esophagites, 1 gastric carcinomata, 3 intracardiac thrombi, 5 aortic thrombi, 11 diabetic and 5 hypertensive retinopathies and 1 with retinal aneurysms. 30 patients (25%) received fibrinolytic therapy, despite a contraindication: The one patient with ventricular thrombus was treated as an ultimate therapy, and amputation was prevented. Two patients showing plaques covered by large thrombi in the descending thoracic aorta were treated because cranial embolism should not occur. Four diabetic patients with multilevel disease, severe claudication and prior retinal bleeding were treated. Fibrinolytic therapy was started on 23 patients after complete healing of the mucosal lesions. CONCLUSION: TEE revealed potential sources of embolization in 4% of the patients and is justified to reduce the individual risk. Retinoscopy should be done in patients with diabetes mellitus and hypertension, and if prior bleeding is present fibrinolysis should be done only if other treatment-regimes are not available.

Aged↗

[Streak retinoscopy. Optical principles and practical recommendations].

The optical principles of streak retinoscopy are demonstrated by diagrams and by optical models. The phenomena observed in the proband's pupil are being explained in two ways: In the first explanation, the image on the proband's retina and its movements are considered, or rather their projection into space; this explanation corresponding to the term "retinoscopy" is commonly used in English textbooks. In the second explanation, the limitations of the light bundle by the proband's and the observer's pupils are considered; hence the term skiascopy (sigma kappa iota alpha = shadow), commonly used in the German literature. The practical hints include retinoscopy through the phoropter, suggestions for the examination of children both with and without cycloplegia, the measurement of accommodation, the detection of opacities and irregularities in the optical media, and the analysis of visual field defects caused by optical anomalies, such as refraction scotomas.

Accommodation, Ocular↗

[Liindner's method of cylinder retinoscopy without theory].

Brief description of Lindner's cylinder retinoscopy for practical application: The main criteria of this accurate method for checking refraction are the direction, shape, speed and brightness of the retinoscopic phenomena moving in the pupil of the examined eye. To determine astigmatism the use of plus cylinders is recommended. Difficulties may be due to the optical aberration at the periphery of a wide pupil, to a scissors phenomenon, and to optical irregularities of the senile lens, corneal opacities etc. In many cases retinoscopy can be performed well without using mydriatics and cycloplegics, respectively. Children must not be overstrained. Generally, final subjective checking is crucial for the prescription of corrective glasses. Mastery of Lindner's cylinder retinoscopy enables the eye specialist to keep refractometry with simple aids, as an essential part of the ophthalmological diagnosis, in his own hands, against the increasing claim of optometrists and opticians.

Adult↗

Static retinoscopy results with and without a fogging lens over the non-tested eye.

This study addressed the question: "Should both eyes be fogged during static retinoscopy?" Static retinoscopy measures were taken on young patients. (N = 50; mean age = 9 years, 4 months). Outcomes revealed no differences except with hyperopic patients, where the lack of a fogging lens over the partner eye resulted in a significant underestimate (p less than .001) of the refractive status. This argues against the use of a lens bar for retinoscopy especially in vision screening programs involving young children.

Adolescent↗

Three-way comparison of retinoscopy, subjective, and Dioptron Nova refractive findings.

On the basis of routine clinical findings taken on a group of 100 patients serving as subjects in the Houston Myopia Control study, a three-way comparison was made between retinoscopy, subjective, and Dioptron Nova refractive findings. Retinoscopy and subjective findings compared very favorably, mean differences being -0.01 D for spherical equivalent power and -0.05 D for cylinder power. Dioptron and retinoscopy findings differed by -0.30 D for spherical equivalent power and -0.13 D for cylinder power, whereas Dioptron and subjective findings differed by -0.33 D for spherical equivalent power and -0.18 D for cylinder power.

Adolescent↗

Use of keratoscopy, slit-lamp biomicroscopy, and retinoscopy in the management of astigmatism after penetrating keratoplasty.

Selective suture removal following corneal transplant surgery can facilitate the reduction of astigmatism. We present concepts concerning astigmatism analysis after keratoplasty related to suture compression by reviewing keratoscopy, slit-lamp biomicroscopy, and retinoscopy findings. Keratoscopy observations indicating tight sutures include peripheral indentation of the keratoscope rings, individual keratoscope ring images between tight sutures, and decentration of the corneal apex away from a tight suture. The utilization of the Van Loenen keratoscope at the slit-lamp in "dynamic keratoscopy" allows the surgeon to readily recognize these findings and also proves useful intraoperatively. Slit-lamp biomicroscope observations indicative of tight sutures include a doughnut of tissue compression, Kaye's epithelial white dots, and epithelial or endothelial stress lines. Retinoscopy observations demonstrate that tight sutures induce astigmatism with the narrowest side of the retinoscopy beam pointing directly toward the tightest suture. Astigmatism management plays a major role in the future success of ophthalmology and needs to be increasingly integrated into the practice of the general ophthalmologist.

Aged↗

A comparison of cycloplegic refraction to the near retinoscopy technique for refractive error determination.

The near retinoscopy technique of refractive error determination was compared to the standard method of cycloplegic refraction using 10 "infants" (3-12 months of age) and 10 "children" (32-109 months of age). There was a significant difference between the techniques for both sphere and cylinder power. Although there was no interaction of refractive technique and age group, the difference between near retinoscopy and cycloplegic refractive error tended to be larger for infants than for children. No significant difference was found when the average refractive values were compared for monocular or binocular conditions and no significant effect was found for either gender or laterality (right versus left eye). Based on these findings, it is suggested that caution be used in substituting the near retinoscopy technique for cycloplegic refraction even utilizing a "correction" factor for the dioptric difference between techniques.

Analysis of Variance↗

Comparison of "near retinoscopy" and subjective refraction in adults.

Static retinoscopy can yield contaminated results because the central rays of the retinoscope beam are oblique with respect to the line of sight of the eye being examined. Additionally, it is difficult to obtain steady distant fixation by children and infants. A near-retinoscopy technique is described, and refractive errors obtained by subjective refraction and near retinoscopy on adults are compared to show that the latter technique yields reliable and valid measures of refraction.

Adult↗

Neutralization at infinity in streak retinoscopy.

A new principle of retinoscopy proposes that the endpoint of neutralization be placed at infinity rather than into the aperture of the retinoscope. The advantages of the method are (1) the pupillary reflex is sharply defined and enhanced at neutralization, (2) the pupillary reflex width is equal to the diameter of the smallest aperture of the observation system, (3) the relative speed of the pupillary reflex is equal to 1, that is, the speed of the reflex is that of the scanning speed, and (4) neutralization at infinity is independent of the observation distance. The lens used gives the "net" retinoscopy.

Humans↗

Retinoscopy and chromatic aberration.

The origin of the apparent farsightedness as revealed by retinoscopy in smaller eyes was investigated by using monochromatic retinoscopy on wild rabbits. Our results indicate that a combination of long wavelength light and chromatic aberration of the subject's dioptrics is the major source of this artifact.

Animals↗

Dynamic retinoscopy: the missing data.

Dynamic retinoscopy is a well described but often overlooked technique that allows rapid assessment of accommodative ability. The key to the technique is the neutralization of the retinoscopic reflex that occurs when the patient accommodates on a target adjacent to the retinoscope. This clinical tool can provide critical data that can help solve treatment dilemmas, such as when a child presents with high hyperopia or when a patient presents at any age with possible accommodative insufficiency. In this review, performance of dynamic retinoscopy will be detailed, with the applicability of the technique demonstrated with use of case examples.

Accommodation, Ocular↗

A teaching attachment for retinoscopy.

A teaching attachment for a conventional streak retinoscope allows a second observer to view the retinoscopic reflex during retinoscopy. The device weighs 200 grams and is attached to the retinoscope by a semi-flexible, rotatable linkage. A beam splitter, one-power telescope, and erecting mirror form a displaced aerial image of the retinoscope peephole for the observer. With identical retinoscopic reflexes observed through the actual peephole and its aerial image, the device can be used to teach basic retinoscopy techniques to new refractionists, or to demonstrate subtle reflexes to more experienced observers.

Equipment Design↗

Comparison of the Retinomax autorefractor with hand-held retinoscopy in 1-year-old infants.

This study aimed to determine the accuracy (and usability) of the Retinomax, a hand-held autorefractor, compared to measurements taken from hand-held retinoscopy (HHR) in a sample of normal 1-year-old children. The study was a method comparison set at four Community Child Health Clinics. Infants (n = 2079) of approximately 1 year of age were identified from birth/immunization records and their caregivers were contacted by mail. A total of 327 infants ranging in age from 46 weeks to 81 weeks (mean 61 weeks) participated in the study. The children underwent a full ophthalmic examination. Under cycloplegia, refraction was measured in each eye by streak retinoscopy (HHR) and then re-measured using the Retinomax autorefractor. Sphere, cylinder, axis of cylinder and spherical equivalent measurements were recorded for HHR and Retinomax instruments, and compared. Across the range of refractive errors measured, there was generally close agreement between the two examination methods, although the Retinomax consistently read around 0.3 D less hyperopic than HHR. Significantly more girls (72 infants, 47.7%), struggled during examination with the Retinomax than boys (52 infants, 29.5%) (P < 0.001). Agreement deteriorated between the two instruments if the patient struggled during the examination (P < 0.001). In general, the Retinomax would appear to be a useful screening instrument in early childhood. However, patient cooperation affects the accuracy of results and is an important consideration in determining whether this screening instrument should be adopted for measuring refractive errors in early infancy.

Female↗

Brightness changes during book retinoscopy.

Book retinoscopy involves the observation of fundus reflex changes that are said to be related to the reading levels or interpretive levels at which persons are functioning. Recent investigations have shown that increasing the cognitive demand on a person can result in accomodative changes in his eye that increase the luminance of the fundus reflex. Since the ability of observers to distinguish such changes is not known, this experiment was designed to determine the minimum detectable increase in luminance. The experiment involved a 2-alternative forced-choice procedure in which observers were required to indicate during which of 2 designated intervals the reflex from a schematic eye became brighter. The luminance of the reflex had to increase by at least 11% beforeit could be detected. A reduction in the lag of accommodation and dilation of the pupil probably account for the changes observed during book retinoscopy.

Accommodation, Ocular↗

Automated refraction. A comparative study of automated refraction with the Nidek AR-1000 autorefractor and retinoscopy.

A prospective study was performed on 46 eyes to compare results of different methods of objective refraction, namely automated refraction with the Nidek AR-1000 autorefractometer and retinoscopy in cycloplegia. We found that automated refraction in cyclopentolate cycloplegia gave results that differed little from results of retinoscopy in atropine cycloplegia both with respect to sphere and cylinder. Axis determination was even better with automated refraction. Dry automated refraction gave inaccurate results for the spheric component presumably because of suboptimal control of accommodation in this group of young patients. We recommend automated refraction in cyclopentolate cycloplegia as an easy, rapid, accurate and convenient method for obtaining an objective refraction where accommodative disorders are suspected.

Accommodation, Ocular↗