More recently, the LogMAR chart (also known as ETDRS chart) has gained favor. Other testing charts developed around that time include the Tumbling E chart, Landolt C chart, and Allen chart. The first and still most widely used today is the Snellen chart. In the 1800s, there was a move to standardize visual testing, which led to the formation of several visual acuity charts with different optotypes. This process requires many functioning pathways, including light reaching the retina with appropriate refraction, the retina's health, and the downstream capacity to transfer and interpret the visual stimuli. Visual acuity testing examines a patient's ability to distinguish different optotypes (recognizable letters or symbols) at a standard distance. The goal of the visual acuity test is to determine clarity or sharpness of vision. A visual acuity test is only one part of a comprehensive ophthalmologic examination.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |