Comparison of preoperative 10-Hz visual evoked potentials to contrast sensitivity and visual acuity after cataract extraction
| Autor: | George W. Weinstein, Sheri A. Cavender, Gung-mei Chao, Robert R. Hobson, J. Vernon Odom |
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| Rok vydání: | 1992 |
| Předmět: |
medicine.medical_specialty
Visual acuity genetic structures Electrodiagnosis Eye disease Visual Acuity After cataract Visual evoked potentials Cataract Extraction Sensitivity and Specificity Cataract Contrast Sensitivity Predictive Value of Tests Physiology (medical) Ophthalmology Lens Crystalline medicine Cutoff Humans Aged Aged 80 and over medicine.diagnostic_test Middle Aged medicine.disease eye diseases Sensory Systems Surgery Spectral sensitivity Evoked Potentials Visual Spatial frequency medicine.symptom Psychology Photic Stimulation |
| Zdroj: | Documenta ophthalmologica. Advances in ophthalmology. 81(2) |
| ISSN: | 0012-4486 |
| Popis: | Cataract patients whose surgical outcomes were in question were referred for testing by visual evoked potentials, elicited through closed eyelids by a luminance stimulus (flash) that appeared 10 times per second. Visual evoked potentials were rated as normal (predicted acuity of 20/50 or better) or abnormal (predicted acuity of 20/60 or worse). Postoperative Arden and Optronix contrast sensitivities and visual acuities were determined in 37 patients who had no intraoperative or early postoperative complications. Arden grating scores of less than 100 were rated as normal. The optimal and cutoff spatial frequency values were determined for the Optronix scores. Optimal and cutoff values of greater or equal to 1 c/deg and 12 c/deg, respectively, were rated as normal. Visual acuities were considered normal at 20/50 or better. Preoperative visual evoked potentials were quantitatively compared to the postoperative contrast sensitivities and visual acuities by 2 × 2 contingency tables. The accuracy of prediction was 79% for the visual acuities, 62% for the Optronix optimal values, 70% for the Optronix cutoff values and 62% for the Arden gratings. |
| Databáze: | OpenAIRE |
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