Review of Optometry: What Snellen Ain’t Tellin’


Oftentimes in practice, we encounter patients who subjectively report changes to their vision—but we then check their acuities and find no measurable difference in Snellen acuity. In these cases, we should consider an alternative measurement of vision quality: contrast sensitivity (CS). This brief, cost-effective screening tool can help us reveal factors relevant to their overall quality of vision. Measuring visual acuity alone, using black letters on a white background, may not be completely representative of a patient’s ability to perform their normal activities of daily living. There is also evidence that CS testing can provide early detection of ocular diseases, even before visual acuity or other entrance tests are affected. Find out more about contrast sensitivity testing in this feature from Review of Optometry. Read More.