Purpose. The accuracy and reproducibility of the MasterVue (Optical Radiation Corp.) were studied. Methods. We used 6 calibrated plano-convex PMMA spherical lenses (30 D, 35 D, 43 D, 50 D, 55 D, 60 D spheres) obtained from Comforma Inc, Norfolk, Va. The radius tolerances were within 0.02 mm. The test sphere was mounted on a XYZ translation stage with micrometer controls (±5 μm). Results. In focus, the Deviation scores (mean difference of the three readings between measured and calibrated surface powers) were 100% within ± 0.25 D for all the test spheres. For 600 μm of defocusing, we observed a mean deviation under ± 0.15 D for the flattest sphere and under ± 0.5 D for the stepest test sphere. Change in focus of 600 μm combined with decentering resulted in the measured values down to ± 0.5 D Conclusion. The MasterVue (MV) unit with its cone of focus alignement shows almost no diopter shift when the spheres are defocused and decentered under 600 μm. In comparison the TMS-1 was found to vary ± 1.5 Diopter shift with 500 μm in focus and decentration.
|Original language||English (US)|
|Journal||Investigative Ophthalmology and Visual Science|
|State||Published - Feb 15 1996|
ASJC Scopus subject areas
- Sensory Systems
- Cellular and Molecular Neuroscience