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Results for “Aphakia”

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At least 289 records · Page 16Linked to original sources
PubMed1984

Aspheric spectacle lens designs for aphakia.

Katz described a design for a postcataract spectacle lens with two aspheric surfaces. Previously, von Rohr and Jeffree had patented designs with similar optical properties, but using steeper lens forms than the Katz design. These three design studies are compared with two aspheric spectacle lenses that have been produced commercially in order to demonstrate the differences in calculated aberrations and their significance on the practicality of a lens design.

Aphakia↗
PubMed1996

Clinical evaluation of back optic radius and power determination by age in pediatric aphakia due to congenital cataract fitted with a Silicone Elaster contact lens.

The purpose of this study was to provide optometrists with suggested base curves and powers for initial lens choice based on the infant's age. A retrospective chart review of 16 congenital cataract patients fitted at U.C. Davis Eye Clinic between July 1987 and May 1993 was performed. Patients with associated ocular pathologies were excluded. All patients were fitted with a Bausch & Lomb Silsoft lens, a Silicone Elastomer, set at a 3.00 D myopic posture, which was decreased with the child's increasing age and activity. This study provides a graphical approach to pediatric aphakic silicone elastomer contact lens fitting. Best-fit regression lines for both graphs have an r squared value better than 0.9. Optometrists will now be able to reference the Base Curve vs. Age and Power vs. Age graphs to determine the initial lens choice when keratometry is unachievable. Furthermore, the data suggest a need for an increased range of powers provided by the Silicone elastomer lens in order to approximate normal visual development.

Aging↗
PubMed1980

Clinical experience with continuous-wear hydrophilic contact lenses in aphakia.

Twenty-two aphakic eyes in seven females and thirteen males were fitted with a new type of soft contact lens designed for continuous wear. Nine patients were operated on for unilateral traumatic cataract, and eleven patients were operated on for senile cataract. Sixteen patients terminated the study. In all cases the visual acuity with lens was almost equal to the acuity obtained with spectacles. The lenses were well tolerated without any special wearing schedule. No serious complications occurred. However, about one third of the patients developed conjunctivitis during the investigation period of eleven months. Four patients showed mild limbal vascular reaction, while only one patient had neovascularisation along the corneal scar caused by the original trauma. The new lens was found to be a good alternative to other contact lenses.

Adolescent↗
PubMed1981

Retinal vessels in the ora region. Possible role in the vitreo-retinal pathology in aphakia.

During intracapsular lens extraction the extreme retinal periphery is subjected to zonula-mediated traction and possible damage to the retinal vessels. The vascular pattern at the ora serrata was studied with special reference to the frequency and distribution of vessels positioned adjacent to the ora structures. The possible role of leakage from such vessels in vitreo-retinal pathology of the aphakic eye is discussed.

Aphakia, Postcataract↗
PubMed1990

Follow-up report of a case of surgical aphakia with an analysis of equine visual function.

More work is necessary to establish corneal dimensions and retinal structure and neural organisation in the equine eye. This paper reports a case of surgical management of bilateral cataracts in a pony and the results of a survey of refractive error in normal horses. Aspects of accommodation are discussed. It is suggested that a difference in retinal receptor organisation between horse and human eyes could explain the good visual performance of the aphakic pony; and that the degree of blurring of vision in the aphakic situation is less, both in absolute terms and in proportion to presumed normal levels of vision, in the horse than in man. It would not seem necessary to consider intra-ocular implants for horses at this stage. The authors feel it is unwise to extrapolate too freely from human data. More information is needed on the optics and retinal topography of many species, particularly horses and dogs, before routine implant surgery on eyes is undertaken.

Accommodation, Ocular↗
PubMed2006

Cystoid macular oedema in paediatric aphakia and pseudophakia.

AIM: To assess the incidence of cystoid macular oedema (CMO), following lensectomy, anterior vitrectomy (limbal and pars plicata), and primary posterior capsulorhexis following surgery for congenital and developmental cataract. METHODS: A prospective study was carried out involving 30 eyes (20 children) with cataract. Lensectomy, primary posterior capsulorhexis, and anterior vitrectomy were performed on all eyes. Vitrectomy was performed using either a limbal or pars plicata approach. Fluorescein angiography was carried out 4-7 weeks after surgery. Fluorescein was administered intravenously and visualised using the Retcam. RESULTS: Anterior vitrectomy was carried out via the limbal approach in 12 eyes and, of these, six were implanted with an intraocular lens. The pars plicata approach was carried out in 18 eyes and 10 received an implant. CMO was not detected in any eye. CONCLUSION: CMO was not detected in the early postoperative period irrespective of approach to anterior vitrectomy or presence of an intraocular lens. Intravenous fluorescein angiography was performed without complication.

Aphakia, Postcataract↗
PubMed2006

Retinoscopic (refractive) estimation of axial length in paediatric aphakia: a comparison with ultrasonic measurement.

AIM: To compare paediatric axial length values estimated from the aphakic refraction alone with axial length values measured by ultrasound. METHODS: Retrospective institutional medical record review of paediatric aphakic patients 12 years of age and younger with documented ultrasonic axial length and objective refraction (retinoscopy) within 3 months of each other. An estimate of axial length was made from the aphakic refraction alone (with an assumed average keratometry value of 44 dioptres) for all patients. RESULTS: 149 eyes of 102 paediatric aphakic patients were identified. The ultrasonic axial length values (mean 22.47 mm, SD 1.69, 95% confidence interval (CI) 0.27) and estimated axial length values (mean 22.41 mm, SD 1.53, 95% CI 0.25) had an average difference of 0.05 mm (SD 1.04, 95% CI 0.17) and were not significantly different (p = 0.56) by the two tailed paired t test. A histogram of the differences that did exist between the two values resembled a normal distribution. The nine eyes with the largest differences between the two values had either low hyperopic aphakic refractions or abnormal average keratometry values. CONCLUSIONS: There was no significant difference between the two groups of axial length values, and the distribution of differences that did exist seemed random. The greatest differences between the two values occurred in longer (less hyperopic) eyes and in eyes with abnormally steep or flat keratometry. Estimation of axial length from the aphakic refraction alone seems to be a useful technique in the average paediatric eye, especially if biometry is unavailable.

Adolescent↗
PubMed1979

'Silicone rubber' lenses in aphakia.

Tesicon, one of the commercially available 'silicone rubber' lenses, was used in the correction of aphakic patients. In 74% of cases the lenses were considered successful for a daily wear regimen by the patient. Furthermore, a small number of patients could wear this lens without interruption for 3 to 6 days at a time. Despite this good acceptance by patients, corneal problems (mainly staining) and lens problems (dry surfaces) were frequently encountered.

Adolescent↗
PubMed1989

Vitrectomy in aphakia: a simplified technique for fundus visualisation.

By using a small air bubble that fills about two thirds of the anterior chamber the erect image of the fundus of the aphakic human eye can be visualised clearly during vitrectomy, enabling the surgeon to operate without the need for vitrectomy lenses. The refractive power of the human aphakic eye is calculated here and the image site and size are presented.

Air↗