Effect of cataract extraction on blue-on-yellow visual field

초록

PURPOSE: It is assumed that cataract can influence the results of blue on-yellow perimetry. However, actual sensitivity change in blue,on-yellow perimetry before and after cataract surgery has not been fully demonstrated. METHODS: Prospective. SETTING: Institutional. STUDY POPULATION: Twenty-two eyes of 22 consecutive patients without ocular pathology, other than cataract, known to influence visual field undergoing cataract surgery. OBSERVATION PROCEDURES: Both white-on-white (W-W) and blue on-yellow (B-Y) perimetries. MAIN OUTCOME MEASURES: Global indexes including mean deviation and other pertinent data of white,on, white and blue-on-yellow perimetries were compared before and after cataract surgery. RESULTS: Mean deviation was improved after cataract surgery in both white-on,white perimetry (from -6.88 dB to -3.36 dB, P < .0001.) and blue-on,yellow perimetry (from -12.22 dB to -3.64 dB, P < .0001, paired t test). However, the mean difference between preoperative and postoperative mean deviation in blue on,yellow perimetry (8.58 +/- 3.96 dB) was significantly higher than that of white,on,white perimetry (3.52 +/- 2.69 dB; P < .0001, unpaired t test). That is, the change in mean deviation was greater in blue,on,yellow perimetry than in white-on,white perimetry by a factor of 2.4 times. CONCLUSION: Cataract causes predominantly a general reduction of sensitivity in both blue,on,yellow and white-on,white perimetries, and the general reduction of blue,on-yellow sensitivity is far greater than that of white on-white sensitivity. (C) 2001 by Elsevier Science Inc. All rights reserved.

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