期刊
CONTACT LENS & ANTERIOR EYE
卷 37, 期 6, 页码 455-460出版社
ELSEVIER
DOI: 10.1016/j.clae.2014.08.001
关键词
Myopia; Custom-design; Contact lenses; Peripheral refraction
资金
- FEDER (COMPETE Program) [PTDC/SAU-BEB/098391/2008, PTDC/SAUBEB/098392/2008]
- Portuguese Foundation for Science and Technology (FCT) [PEST-C/FIS/UI607/2011]
- Fundação para a Ciência e a Tecnologia [PTDC/SAU-BEB/098391/2008] Funding Source: FCT
Purpose: To evaluate the performance of two experimental contact lenses (CL) designed to induce relative peripheral myopic defocus in myopic eyes. Methods: Ten right eyes of 10 subjects were fitted with three different CL: a soft experimental lens (Exp-SCL), a rigid gas permeable experimental lens (ExpRGP) and a standard RGP lens made of the same material (StdRGP). Central and peripheral refraction was measured using a Grand Seiko open-field autorefractometer across the central 60 degrees of the horizontal visual field. Ocular aberrations were measured with a Hartman-Shack aberrometer, and monocular contrast sensitivity function (CSF) was measured with a VCTS6500 without and with the three contact lenses. Results: Both experimental lenses were able to increase significantly the relative peripheral myopic defocus up to -0.50 D in the nasal field and -1.00 D in the temporal field (p < 0.05). The ExpRGP induced a significantly higher myopic defocus in the temporal field compared to the ExpSCL. ExpSCL induced significantly lower levels of Spherical-like HOA than ExpRGP for the 5 mm pupil size (p < 0.05). Both experimental lenses kept CSF within normal limits without any statistically significant change from baseline (p > 0.05). Conclusions: RGP lens design seems to be more effective to induce a significant myopic change in the relative peripheral refractive error. Both lenses preserve a good visual performance. The worsened optical quality observed in ExpRGP was due to an increased coma-like and spherical-like HOA. However, no impact on the visual quality as measured by CSF was observed. (C) 2014 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.
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