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F. Faraldi, A. Fea, M. M. Rabbione, C. Pollastro, F. M. Grignolo; Normative Data, Short and Long-Term fluctuation for the Opko/OTI Microperimeter. Invest. Ophthalmol. Vis. Sci. 2010;51(13):934.
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© ARVO (1962-2015); The Authors (2016-present)
Although microperimetry has been widely used for the evaluation of macular diseases, few papers have reported normative data and none the short and long term fluctuation with this method. Purpose of the study is to provide these data in a normal population.
Light threshold was measured in 55 subjects with (age range: 20-79, VA ≥ 0,9, Sph <-4, <+2,5, cyl<1,5), without retinal or optic nerve damage and without history of previous trauma or ocular surgery. One eye was randomly selected. A 5x5 square was investigated (25 points, 9º). Each subject was tested twice in each session (SF) and once more one week later (LF). SF and LF were calculated using the formula √ (Xj2-Xj1)2/2n.
Light sensitivity decreased with age. SF was always inferior to 1,5 dB and not significantly lower than LF.
Normative data, SF and LF for this microperimetric method provide data to be used in clinical studies. Previous studies demonstrated that SF was significantly lower than LF with w/w perimetry. The precise and repeatable presentation of the stimuli on a retinal location might account for both lower SF and LF as compared to standard perimetry.
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