Perception of Purkinje vessel shadows and foveal granular pattern as a measure of potential visual acuity
| Autor: | Fernando Murillo-Lopez, David L. Guyton, A. Edward Maumenee |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Fovea Centralis
Visual acuity genetic structures Light media_common.quotation_subject Visual Acuity Potential acuity meter Refraction Ocular Sensitivity and Specificity Cataract Retina chemistry.chemical_compound Foveal Predictive Value of Tests Perception medicine Humans media_common business.industry Entoptic phenomenon Vision Tests Vernier acuity Retinal Vision Entoptic eye diseases Sensory Systems Sclera Ophthalmology medicine.anatomical_structure chemistry Optometry Surgery sense organs medicine.symptom business |
| Zdroj: | Journal of cataract and refractive surgery. 26(2) |
| ISSN: | 0886-3350 |
| Popis: | Purpose To compare perception of 2 entoptic phenomena, the Purkinje vessel shadows and the foveal granular pattern, as measures of retinal visual acuity using a transscleral illumination technique that bypasses the anterior segment. Setting Retinal Vascular Center and General Eye Clinic, Wilmer Ophthalmological Institute, Johns Hopkins Hospital, Baltimore, Maryland, USA. Methods Both eyes of 85 patients with clear ocular media, many with retinal disease, were tested for perception of these entoptic phenomena. Also, retinal visual acuity was measured with a Potential Acuity Meter through the current refractive correction. Results Of 114 eyes with retinal acuity of 20/40 or better, 99% perceived the Purkinje vessel shadows and 86% perceived the foveal granular pattern. Of 45 eyes with retinal acuity of 20/80 or worse, 73% perceived the Purkinje vessel shadows and 4% perceived the foveal granular pattern. Conclusion Perception of the Purkinje vessel shadows does not distinguish between good and poor retinal acuity, whereas nonperception of the vessel shadows strongly suggests poor acuity. Perception of the foveal granular pattern, on the other hand, provides a positive indication of good retinal acuity and will likely prove to be predictive of good vision after removal of significant media opacity. |
| Databáze: | OpenAIRE |
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