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KMID : 1159320140160030363
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Korean Journal of Vision Science
2014 Volume.16 No. 3 p.363 ~ p.371
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Measurement of spherical lenses power using 4 point and Shack-Hartmann method on Auto Lensmeter
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Song Kyoung-Sek
Kim Tae-Hun
Sung A-Young
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Abstract
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Purpose: The purpose of this research is to analyze the accuracy of digital lensmeters which are using 4 point and Shack-Hartman method respectively.
Methods: The measured lenses are from the most frequently used manufacturers’ones in Korea. The lenses are from 3 different brands(A, B, C) with spherical power of -5.00D, -10.00D, and -15.00D.
Results: The following results were obtained using 4 point method employed lensmeter; the average value of refractive power was -4.89D for manufacture A as -5.00D, -4.92D for manufacture B as -5.00D and -4.97D for manufacture C as -5.00D, respectively. The average value of refractive power was -9.94D for manufacture A as -10.00D, -9.94D for manufacture B as -10.00D and -9.93D for manufacture C as -10.00D respectively. The average value of refractive power was -14.96D for manufacture A as -15.00D, -14.90D for manufacture B as -15.00D and -14.92D for manufacture C as -15.00D respectively. The following results were also obtained using Hartman Shack method employed lensmeter; The average value of refractive power was -5.00D for manufacture A as -5.00D, -5.01D for manufacture B as -5.00D and -5.02D for manufacture C as -5.00D, respectively. The average value of refractive power was -10.00D for manufacture A as -10.00D, -10.01D for manufacture B as -10.00D and -10.00D for manufacture C as -10.00D respectively. The average value of refractive power was -15.09D for manufacture A as -15.00D, -15.01D for manufacture B as -15.00D and -15.08D for manufacture C as -15.00D respectively.
Conclusion: As per the minus diopter spherical lenses, the Shack-Hartman lensmeter showed better accuracy in spherical lenses values reading.
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KEYWORD
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digital lensmeter, spherical refractive power, 4 spot, Shack?Hartmann
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