Repeatability of internal aberrometry with a new simultaneous capture aberrometer/corneal topographer.

摘要: Purpose. To compare repeatability of internal eye aberrations derived from aberrometry and corneal topography (CT) measured simultaneously by the Innovative Visual Systems Discovery, against time displaced but same instrument measurement (Nidek OPD-Scan 3), different (Medmont E300 Imagine Eyes irx3). Methods. Three CT measurements were captured with each instrument, except for 3 where three scans followed a single CT. Measurements repeated across 2 days. Corneal surface Zernike coefficients subtracted to establish aberration coefficients. For 3, instrument's software. Repeatability second-order root mean square (RMS), spherical aberration, coma RMS, trefoil refraction components M, J0, J45 assessed using intraclass correlation coefficient (ICC). Results. Intrasession was similar between Discovery E300/irx3, E300/irx3 slightly more repeatable RMS. Across days, most RMS (ICC 0.98) 0.96) 0.88). All instruments less higher order only moderately (both ICC ≥ 0.75). The highly all refractive 0.96). M J0 0.89). component not cylindrical components. Conclusions. lower suggests caution in their use until further work is carried out investigate sources error develop methods improve repeatability.