Prediction of Visual Acuity in Macular Disease Using Hand-held Laser Interferometer

To evaluate the predictability of visual outcome in vaculopathy patients after treatment, we compared the difference between the pre-treatment visual acuity measured by hand-held laser interferometer and the posttreatment corrected visual acuity using Han`s visual acuity chart. Disease distribution was as follows; BRVO(18 cases), CRVO(11 cases), CSCR(9 cases), posterior uveitis(4 cases). The mean up period was 3.45 months. Among 42 cases, 28 eyes showed positive disparity and 13 eyes showed negative disparity. The range of disparity was from -0.2 to +0.3(mean 0.113). The post-treatment visual acuity was predictable within 2 lines in 38 eyes(90%) We concluded that the hand-held laser interferometer is one of the reliable methods to predict the post-treatment visual acuity in maculopathy patients.

Hand-held Laser Interferometric Prediction of Postoperative Visual Acuity in Cataractous Eye

The visual acuity measured preoperatively by hand-held laser interferometer was compared to the visual acuity measured postoperatively by Han s visual acuity in 86 cataractous eyes treated by phacoemulsification with posterior chamber IOL insertion in order to get the prediction of postoperatively corrected visual acuity. The follow up period was at least 4 weeks. In the 56 cases with immature cataract and normal retina, the postoperative visual acuity was predictable within 2 lines in 52 eyes (92.8%). In 20 eyes with mature cataract including nuclear sclerosis, postoperative Han's visual acuity was predictable within 2 lines in 7 eyes (35%), and one patient showed positive disparity. In 15 eyes with retinopathy, 10 eyes (66.7%) showed positive disparity and 3 eyes (20%) showed negative disparity. We concluded that the hand-held laser interferometer is a reliable method to predict the postoperative visual acuity in immature cataract with normal retina.

Prediction of Outcomes from Cataract Patients by Using Hand Held Laser Interfrometry

To evaluate the prediction of visual outcome in cataract patients, the authors compared the preoperatively measured vision using hand-held laser interferometry(HEINE LAMBDA 100, GERMANY) and Han's visual acuity chart with the postoperatively corrected vision. Among 40 patients, in the 12 cases with immature cataract and normal macula, the postoperative measured acuity was predicted within two lines in 7 cases(58%), and in the 27 cases with mature cataract including nuclear sclerosis, the disparity under -2 was only 6 cases(21%). In the 6 cases with macular abnormality, one patient showed positive disparity. These results indicate that the prediction of visual outcome for catarct sugery using the hand-held laser interferometer was reliable in immature catarct with normal macula.