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KMID : 1011420120170020143
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 2 p.143 ~ p.151
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Relationship between Corneal Type, Corneal Astigmatism and Lens Fitting States and the Stable Centration of Spherical RGP Lens
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Lim Shin-Gyu
Lee Min-Ha
Choi Sun-Mi
Park Sang-Hee
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: The present study was conducted to investigate whether there is any difference in the centration of
spherical RGP lens on cornea according to corneal types, corneal astigmatism and lens fitting states.
Methods: Spherical RGP lens was fitted on 29 eyes of round-typed cornea and 45 eyes of symmetric bowtie-typed cornea with 0.00~2.75 D of corneal astigmatism in alignment, steep or flat. Their lens centrations on cornea were analyzed by taking photographs.
Results: The centration of spherical RGP lens in the vertical direction was decentrated to downward direction in all cases, and the degree of decentration was not consistent. The lens centration in horizontal direction was significantly more-decentrated to the temporal meridian as base curve of lens was increased, and the degree of decentration was different according to the corneal type, corneal astigmatism and fitting states. With the same degree of astigmatism, the lens decentration to the temporal meridian was bigger in round-typed cornea than that in symmetirc bowtie-typed cornea.
Conclusions: The centration of spherical RGP lens varies depending on lens fitting states, corneal astigmatism, and corneal types. Thus, the consideration of these factors may improve the success rate in RGP lens prescription.
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KEYWORD
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Spherical RGP lens, Lens centration, Corneal type, Corneal astigmatism, Lens fitting states
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