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KMID : 1011420140190040471
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 4 p.471 ~ p.477
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A Study on the Method for the Local Transmittance Measurements of the Ocular Lens
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Park Sang-Kook
Ri Hyeong-Cheol
Youk Do-Jin
Sung Duk-Yong
Kang Sung-Soo
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Abstract
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Purpose: We have analyzed the transmittance distribution of the ocular lens using local transmittance microscope to investigate the optical homogeneity of the lens.
Methods: The transmittance of the laser which is focused on the surface of the ocular lens was measured by using the photo-detector and lock-in amplifier and analyzed. Multi-coated, uncoated, and progressive lenses were analyzed.
Results: In the measurement of the progressive lens and a physical stimulated lens, local transmittance microscopy analysis showed a high degree of match with the measurement results through the optical microscope. In addition, the average value of the transmittance is reduced and the standard deviation was increased in the presence of optical defects. In unstimulated lens, there are a large impact on transmittance whether the anti-reflective coating is presence or absence in both the local transmittance microscopy and general transmittance analysis.
Conclusions: The distribution of the transmittance measured by local transmission microscopy were changed when the various stimulus is applied to the lenses. These analyzes by local transmission microscopy can be utilized as a way to evaluate or determine the uniformity of the coating film or lens.
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KEYWORD
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Transmittance, Local properties, Ocular lens, Coating film, Microscope
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