What Is 20/20 vision?
20/20 vision is a term used to express normal visual acuity (the clarity or sharpness of vision) measured at a distance of 20 feet. If you have 20/20 vision, you…
Teller Acuity Cards
Cards Are Effective in Detecting Amblyopia Detection of amblyopia in infants and toddlers is difficult because the current clinical standard for this age group, fixation preference, is inaccurate. Although grating…
What is ETDRS?
ETDRS stands for Early Treatment of Diabetic Retinopathy Study. The first ETDRS trial was a multisite, randomized clinical trial designed to evaluate argon laser photocoagulation and aspirin treatment in the…