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KMID : 1011420150200040471
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Journal of Korean Ophthalmic Optics Society
2015 Volume.20 No. 4 p.471 ~ p.476
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A Comparative Study on the Local Transmittance Homogeneity of the Ocular Lens
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Park Sang-Kook
Ri Hyeong-Cheol
Jang Yoon-Seok
Sung Duk-Yong
Kang Sung-Soo
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Abstract
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Purpose: We have analyzed the transmittance distribution of various ocular lenses using local transmittance microscope to investigate the optical homogeneity of the lens.
Methods: The local transmittance of the laser which is focused on the surface of the spectacle lens was measured by using the photo-detector, lock-in amplifier and motorized-stage. 25 multi-coated lenses with non-tinted of 5 groups and 45 multicoated lenses with tinted of 9 groups were analyzed as a sample respectively.
Results: Average and deviation of local transmittance for nontinted lenses were measured almost uniformly with various refractive index and coating. However, deviation of transmittance of for tinted lenses was analyzed as about 3.7 times larger than that of non-tinted lenses. Inhomogeneity of local transmittance of for tinted lenses was also analyzed as about 3.1 times larger than that of non-tinted lenses.
Conclusions: We could analyze that standard deviation of transmittance and inhomogeneity of local transmittance of for tinted lenses is larger than that of non-tinted lenses using the local transmittance microscope. These analysis using local transmittance microscope can be utilized as a way to evaluate lens performance and improve optical homogeneity.
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KEYWORD
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Ocular lens, Transmittance, Local properties, Homogeneity, Microscope
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