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Vertex power measurement of spherical/cylinder lens by four point and Hartman-Shack method using digital lensmeter
Purpose: The test is designed to investigate the differences in measurement method between conventional four point method and Hartman Shack principle applied method in digital lensmeters. Methods: The lenses tested are from the most frequently used manufacturers’ ones in Korea. The lenses are from 3 different brands with spherical power of -5.00D, -10.00D, and -15.00D. Cylinder lenses are sourced with same criteria with cylinder power of C-0.50D, C-1.25D and C-2.00D. Before making the measurement, all the sample were stored in standard saline solution for at least 30 min and maintained at standard temperature. Results: The Hartman-Shack method employed digital lensmeter showed a better accuracy performance in spherical lens value measurement, meanwhile the four points method based lensmeter showed a better performance in cylinder value. For the spherical cylinder combined value lenses, the Hartman-Shack method employed lensmeter performed better than four point method based lensmeter. Conclusions: As per the minus diopter spherical cylinder lenses, the Hartman Shack lensmeter showed better accuracy in spherical values and four point method based lensmeter showed better reading for cylinder values.
