Abstract：
OBJECTIVE:To determine the most appropriate method for measuring the effect on contrast sensitivity of neodymium:YAG (Nd:YAG) posterior capsulotomy for early posterior capsular opacification (PCO). DESIGN:Prospective comparison of five different methods for luminous contrast sensitivity testing in patients undergoing capsulotomy. PARTICIPANTS:Sixteen patients with PCO involving the visual axis and visual acuities of 20/40 or better were recruited sequentially. INTERVENTION:All patients were tested with each of the five tests before and after Nd:YAG capsulotomy. MAIN OUTCOME MEASURES:The contrast sensitivity function was measured with variable contrast sine wave gratings using the Vistech VCTS 6500, Mentor B-VAT-II and a computer graphics system. Peak contrast sensitivity at 3 cyc/deg was compared with two letter tests, the Pelli-Robson chart, and a computer that generated optotypes. RESULTS:Significant generalized improvement that was not frequency selective was measured over the entire contrast sensitivity function after capsulotomy. The five tests did not significantly differ (P > 0.05) in their measurement of peak contrast sensitivity (3 cyc/deg) improvement after capsulotomy. Letter-based tests showed better agreement and lower variance than gratings tests. Visual acuity and contrast sensitivity improvement were poorly correlated. CONCLUSIONS:This study shows that contrast sensitivity is adequately documented by a single measurement at 3 cyc/deg, is an informative supplement to visual acuity, and that little extra information is to be gained by measuring further spatial frequencies in eyes with PCO. Peak contrast sensitivity is best determined using a letter-based test.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Tan JC,Spalton DJ,Arden GBdoi
10.1016/S0161-6420(99)90154-9subject
Has Abstractpub_date
1999-04-01 00:00:00pages
703-9issue
4eissn
0161-6420issn
1549-4713pii
S0161-6420(99)90154-9journal_volume
106pub_type
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