Abstract
Abstract: :
Purpose:To investigate visual field changes after cataract extraction in the Advanced Glaucoma Intervention Study (AGIS). Methods:One hundred–fifteen eyes from AGIS with at least two reliable visual fields within one year before and after cataract surgery were included .The average mean deviation (MD), pattern standard deviation (PSD), and corrected pattern standard deviation (CPSD) were compared before and after cataract extraction. To evaluate changes in the extent of scotomas, the number of significantly depressed points on total and pattern deviation plots was compared before and after surgery. To investigate changes of scotoma depth after surgery, we described an index, "scotoma depth index", defined as the average of threshold deviation from normal for the 3rd to 5th most depressed locations. Results:The mean values for MD, PSD, and CPSD were –12.8, 6.3, and 5.8 dB before and –11.5, 6.7, 6.2 dB after cataract surgery (p < .003 for each comparison). The mean number of significantly depressed points on total deviation and pattern deviation plots was 45.6 and 26.4 before cataract extraction and 40.3 and 27.8 after surgery, respectively (p < .005 for both comparisons). Scotoma depth index did not change after cataract extraction (–23.8 vs. –23.0 dB, p > .05). There was a correlation between worse MD and improvement of MD after surgery (p = .05). Conclusions:Cataract extraction caused significant improvement in mean sensitivity of the visual field. Indices of field unevenness increased after cataract extraction. Scotomas became larger. The sensitivity in the deepest area of scotomas did not change after cataract surgery.
Keywords: visual fields • treatment outcomes of cataract surgery