Accuracy and reproducibility of the mastervue videokeratoscope

G. Renard, K. Issid, O. Serdarevic, J. M. Legeais, Jean-Marie A Parel, Y. Pouliquen

Research output: Contribution to journalArticle

Abstract

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 languageEnglish
JournalInvestigative Ophthalmology and Visual Science
Volume37
Issue number3
StatePublished - Feb 15 1996

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Polymethyl Methacrylate
Lenses
Reading
Radiation
polyurethane-polypropylene composite

ASJC Scopus subject areas

  • Ophthalmology

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Renard, G., Issid, K., Serdarevic, O., Legeais, J. M., Parel, J-M. A., & Pouliquen, Y. (1996). Accuracy and reproducibility of the mastervue videokeratoscope. Investigative Ophthalmology and Visual Science, 37(3).

Accuracy and reproducibility of the mastervue videokeratoscope. / Renard, G.; Issid, K.; Serdarevic, O.; Legeais, J. M.; Parel, Jean-Marie A; Pouliquen, Y.

In: Investigative Ophthalmology and Visual Science, Vol. 37, No. 3, 15.02.1996.

Research output: Contribution to journalArticle

Renard, G, Issid, K, Serdarevic, O, Legeais, JM, Parel, J-MA & Pouliquen, Y 1996, 'Accuracy and reproducibility of the mastervue videokeratoscope', Investigative Ophthalmology and Visual Science, vol. 37, no. 3.
Renard G, Issid K, Serdarevic O, Legeais JM, Parel J-MA, Pouliquen Y. Accuracy and reproducibility of the mastervue videokeratoscope. Investigative Ophthalmology and Visual Science. 1996 Feb 15;37(3).
Renard, G. ; Issid, K. ; Serdarevic, O. ; Legeais, J. M. ; Parel, Jean-Marie A ; Pouliquen, Y. / Accuracy and reproducibility of the mastervue videokeratoscope. In: Investigative Ophthalmology and Visual Science. 1996 ; Vol. 37, No. 3.
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N2 - 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.

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