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N. Sekhon, A.S. Venkatraman, J. McSoley, D.L. Budenz, D.R. Anderson; The Effects of Cataract Extraction on the Matrix Visual Field of Normal Eyes . Invest. Ophthalmol. Vis. Sci. 2006;47(13):664.
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© ARVO (1962-2015); The Authors (2016-present)
To Investigate the Effects of Cataract Extraction and IOL placement on Matrix Visual Field of Normal Eyes.
This prospective study enrolled 28 patients, with visually significant cataract but otherwise normal eyes. Preoperative examination included glare testing with both the high and low glare method available on the Humphrey Systems Automatic Refractometer / Keratometer and frequency doubling perimetry using the 24–2 FDT Threshold program of the HumphreyMatrix Visual Field Instrument. FDT Matrix. The Lens Opacification Classification System (LOCS) II was used to classify the cataracts by an experienced grader who was masked to the acuity, glare test and Matrix results. Postoperative testing with the glare tests and FDT Matrix was completed after a minimum of four weeks postoperatively. The data collected for best corrected visual acuity, visual acuity with high and low glare, mean deviation, pattern standard deviation and glaucoma hemifield test scores pre and postoperatively, were analyzed using paired t tests.
Patients had a mean age of 70.56 ± 8.9 yrs. There were 14(50%) females and 14(50%) males. 51.9% were White, 11.1% African American, 33.3% Hispanic and 3.7% other. The mean best corrected visual acuity improved from 20/60 to 20/25, p < 0.001. Visual acuity with low glare improved on an average from 20/125 to 20/40, p = 0.002. Visual acuity with high glare improved from mean 2/200 to 20/160, p<0.001. Mean IOP remained unchanged after cataract extraction. The average Mean Deviation improved from –8.5 to –3.7 (P<.001). However the pattern standard deviation (mean psd=3.54, pre & post, P = .992), stayed the same. Of the 19/26 (73%) eyes with abnormal preoperative GHT scores, 5/19 (26%) improved to normal. Pearson’s correlation between posterior capsular LOCS score and mean deviation showed r = –0.568
Cataract extraction resulted in statistically significant improvement in best corrected visual acuity with high and low glare test conditions. Mean Deviation improved after cataract extraction in most normal eyes. However no statistically significant effect was noted on pattern standard deviation and IOP. There was no compelling relationship between Mean Deviation of preoperative Matrix visual field and LOCS score. This study indicates that the Matrix visual field may falsely identify patients as having glaucoma, which resolves after cataract removal. Caution is advised when interpreting the results of Matrix visual fields in the presence of cataract.
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