Beyond Snellen Acuity
The Assessment of Visual Function After Refractive Surgery
Arch Ophthalmol. 2001;119:1371-1373.
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THE GOAL of refractive surgery is to improve unaided vision in ametropic
patients without the aid of spectacles and contact lenses. Refraction for
the prescription of these appliances has traditionally been based on high-contrast
distance visual acuity using Snellen charts. It is under such conditions that
residual spherocylindrical refractive error and visual acuity following refractive
surgery are usually assessed, and from these measures, the patient's visual
function is inferred. It is now generally accepted that high-contrast distance
visual acuity and residual refractive error are indeed correlated with overall
patient visual function and satisfaction following surgery1;
however, there are many refractive surgery patients with minimal residual
spherocylindrical error and excellent uncorrected high-contrast distance visual
acuity who are dissatisfied with their postoperative quality of vision. Refractive
surgeons will be familiar with a variety of problems expressed by such patients,
ranging from general, unspecific complaints, to specific phenomena, such as
halo formation . . . [Full Text of this Article]
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