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KMID : 1011420140190020163
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 2 p.163 ~ p.169
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A Study on the Change of Corneal Refractive Power before and after Wearing RGP Contact Lenses by Flat Fitting and Alingment Fitting with Diagnostic Method
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Lee Dae-Won
Kim In-Suk
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Abstract
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Purpose: This study is for compared the change of corneal refractive power before and after wearing of rigid gas permeable contact lense with diagnostic method which is 1 D flatter than alignment fitting on right eye and alignment fitting on left eye for 2 months and investigate the preference.
Methods: Twenty middle school and high school students (40 eyes) who had never worn a contact lense before for no corneal topographical change, no ocular disease, no experience of ophthalmic surgery and have normal tear amount were selected for this study and corneal refractive power were examined before wearing rigid gas permeable contact lense and adaptation status and corneal examination were performed after 10 days of wearing and after cheking up the continuation of wearing, all candidate wear contact lens 8 hours per day for 2 month and corneal refractive power were compared.
Results: After 2 months of wearing with 1 D flatter than the alignment fitting on right eyes, there was significant difference in the central corneal refractive power was 43.84±1.33 D, flat K power was 43.05±1.29 D, and steep K power was 44.61±1.42 D decreased than before wearing (p<0.001, 0.001, 0.047). The e-value of the principal meridians also shows statistically significant difference (p=0.037, 0.015). After 2 months of wearing with alignment fitting on left eyes, the central corneal refractive power was 44.40±1.26 D, flat K power was 43.57±1.23 D. and flat K e-value was 0.58±0.05 which showed no statistically significant difference (p = 0.769, 0.614, 0.181). But steep K power was 45.25±1.36, and steep K e-value was 0.45±0.18 which shows statistically significant difference (p=0.018, 0.027).
Conclusions: Consider the comfort, clear vision, dryness for preference fitting investment, 6 students (30%) prefer right eye which is 1 D flatter fitting, 14 students (70%) prefer left eye which is alignment fitting. For rigid gas permeable fitting needed for accurate examination and should prescribe the alignment fitting which is suitable for each cornea.
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KEYWORD
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Diagnostic fitting, Alignment fitting, Flat fitting, Lens preference, Corneal refractive power
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