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Acuity and aberrations in Rose K lenses for keratoconus
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Acuity and aberrations in Rose K lenses for keratoconus
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Acuity and aberrations in Rose K lenses for keratoconus
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Dissertation
Acuity and aberrations in Rose K lenses for keratoconus
2008
Overview
Objectives. The Rose K1 lens has been shown to be comfortable and successfully fit in a high percentage of keratoconus patients. The addition of spherical aberration correction in the Rose K2 lens has been claimed to improve visual acuity. The aim of this study is to determine if there is a difference in visual acuity or aberrations in the Rose K1 vs. the Rose K2 lens. Methods. High contrast and low contrast acuity was measured in photopic and mesopic conditions on eleven keratoconic subjects with the Rose K1 and Rose K2 lens. Researcher and subject were masked as to which lens was the Rose K2. Results. A generalized estimating equations model was used to show that visual acuity results were not statistically significant different between the two lenses (p > |z| = 0.283) when controlling for contrast and lighting. Wavefront data of higher order aberrations measured while subjects wore each of the lenses also failed to show any statistical difference in amount of spherical aberration (p > |z| = 0.986). Subjects reported a preference for the Rose K1 lens in vision (67%), comfort (54%), and overall performance (54%). Conclusions. The results of this study can not demonstrate to practitioners that the back surface addition of spherical aberration correction to keratoconic lenses is dramatically beneficial. There may still be potential for visual performance enhancement in keratoconic patients, using well fit custom lenses that optimize multiple parameters.
