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FDT perimetry sensitive in detecting visual field defects with cataract
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Cataract affects the mean deviation but not the pattern standard deviation in frequency-doubling technology perimetry, a group of researchers has shown.
Results of the prospective study showed that frequency-doubling technology (FDT) outcomes were similar to achromatic automated static perimetry, said Angelo P. Tanna, MD, and colleagues at Northwestern University Feinberg School of Medicine. Researchers evaluated 44 patients with cataract but otherwise normal ophthalmic examinations. Patients underwent FDT perimetry using full-threshold C-20 strategy in both eyes 1 month before cataract extraction. The unaffected eye served as the control. FDT was performed between 3 weeks and 3 months after surgery. Changes in mean deviation and pattern standard deviation were adjusted for the change in the control eye from the learning effect.
“Among eyes that underwent cataract surgery, 58.5% had an abnormal [visual field] before surgery, compared with 14.6% after cataract surgery. Among the control eyes, 29.3% were abnormal before surgery in the fellow eye, compared with 24.4% after cataract surgery,” the researchers said.
In the eyes with cataract, the median preoperative VA was 20/60 (range: 20/30 to 20/800). Mean postoperative VA was 20/30 (range: 20/20 to 20/70). In the control group, the mean deviation went from –1.74 dB preop to –0.94 dB postop.
The study was published in the August issue of Ophthalmology.