Application of ZyQv visual acuity chart in corneal refractive sugery

Abstract

Objective To introduce the ZyQv visual acuity chart and its application in corneal refractive surgery.Methods Visual acuity of 54 individuals of pre-and post-LASIK under different contrast and illuminate was evaluated with the ZyQv visual acuity chart and compared with the logarithmic visual acuity chart. Results There was no statistical difference between the preoperative BCVA and UCVA 1 week, 1 month and 3 months postoperatively obtained with the logarithmic visual acuity chart.Results with the ZyQv visual acuity chart displayed as below: 90% contrast visual acuity of three groups in bright and dark environments declined significantly at 1 week after operation, and recovered to the preoperative level at 1 month after surgery; 10% contrast visual acuity of three groups declined significantly at 1 week after surgery, 10% contrast visual acuity of low myopia group recovered to the preoperative level at 1 month after surgery, as for the moderate and high myopia group, 10% contrast visual acuity still below the preoperative level at 3 month alter surgery (moderate myopia group in the bright environment excluded).Conclusions ZyQv visual acuity chart is simple and convenient to use and operate; it could be used in many aspects of corneal refractive surgery, e.g.consummating of preoperative examination, evaluating visual quality after surgery, continuously observing the recovery of visual acuity dynamically, clinical experiment and correlate investigation, et al. Key words: Visual acuity chart; LASIK; Myopia; Contrast