Vision Assessment of Nonverbal Patients

Abstract

Introduction

The most important aspect of a pediatric eye exam is the quantitative measurement of visual acuity, yet many children in a pediatric practice are nonverbal or preverbal.

Methods

The clinician has a number of options for assessing vision in these children, including the central, steady, maintained technique, behavioral measurements, and electrophysiological measurements. Each of these approaches has advantages and disadvantages.

Results

All techniques for acuity measurement have their pros and cons. A newer technique, the sweep visual evoked potential (sVEP), can be used to measure different types of visual acuity (grating, vernier, contrast sensitivity) and also does not require any verbal responses.

Conclusion

Since vernier acuity offers a better approximation to Snellen acuity, the sVEP holds promise as a useful tool in the pediatric office and lab.

• visual evoked potential
• sweep VEP
• vernier acuity
• grating acuity