Visual evoked potential measurement of contrast sensitivity in a case of retinal laser injury reveals visual function loss despite normal acuity
| Autor: | Harry Zwick, Randolph D. Glickman, Charles S. Ballentine, Bennie Pierce, Harold G. Longbotham, Joseph M. Harrison |
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| Rok vydání: | 1996 |
| Předmět: |
education.field_of_study
medicine.medical_specialty Visual acuity Visual perception genetic structures business.industry Population Retinal Stimulus (physiology) Audiology Luminance chemistry.chemical_compound Optics chemistry medicine Spatial frequency Evoked potential medicine.symptom education business |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| Popis: | Although visual function following retinal laser injuries has traditionally been assessed by measuring visual acuity, this measure only indicates the highest spatial frequency resolvable under high-contrast viewing conditions. Another visual psychophysical parameter is contrast sensitivity (CS), which measures the minimum contrast required for detection of targets over a range of spatial frequencies, and may evaluate visual mechanisms that do not directly subserve acuity. We used the visual evoked potential (VEP) to measure CS in a population of normal subjects and in patients with ophthalmic conditions affecting retinal function, including one patient with a laser injury in the macula. In this patient, the acuity had recovered from |
| Databáze: | OpenAIRE |
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