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C.P. Chan, C. Abraham, J.A. Burkhardt, L. Frederick, D.K. Roberts, A.P. Tanna; Impact of Amblyopia on Frequency–Doubling Technology Perimetry . Invest. Ophthalmol. Vis. Sci. 2004;45(13):2585.
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Purpose: To describe the results of frequency–doubling technology (FDT) perimetry in amblyopic eyes. Methods: Subjects between the ages of 18–65 years with unilateral refractive or strabismic amblyopia were prospectively identified at the time of presentation for a complete ophthalmic examination at two eye care facilities. Patients with ophthalmic pathology, including visually significant cataract, were excluded. The non–amblyopic eye was required to have best corrected visual acuity of 20/25 or better. Both eyes underwent FDT perimetry using the full threshold C–20 program. The eye tested first was randomly selected. Each subject’s best refractive correction was worn. Results: Nineteen subjects with unilateral amblyopia were studied. Six had anisometropic amblyopia and 13 had strabismic amblyopia. Ten right and 9 left eyes were amblyopic. There were 7 males and 12 females. The mean age was 40.6 years (range, 22–61 years). Foveal sensitivity was lower (P<0.001) and mean deviation (MD) was lower (P=0.0015) in the amblyopic eyes. There was no significant difference in pattern standard deviation (PSD) (P=0.17). The visual fields were judged to be abnormal in 10 of 19 of the amblyopic eyes and 4 of 19 fellow normal eyes. Conclusions: Refractive or strabismic amblyopia may result in abnormalities on FDT perimetry.
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