The effect of glass prism and membrane prism on visual function

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  • 眼鏡内組み込みプリズムと膜プリズムの視機能の比較

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[Purpose] To examine the effect of glass prism and Fresnel membrane prism on visual function.<BR>[Subject and Method] Twenty eyes of 20 subjects without ocular abnormalities were examined. Age ranged from 21 to 47 years (average 28.8). We evaluated visual acuity ,contrast sensitivity using the CAT2000™ (NEITZ) and root mean square (RMS) value of high order aberration (coma like (S3) aberration, spherical like (S4) aberration and S3+S4 aberration) by the wavefront analyzer KR-9000PW™ (TOPCON). All subjects were tested under no prism, wearing 8 prism diopter (PD) glass prism and 8PD Fresnel membrane prism.<BR>[Results] Visual acuity decreased significantly wearing Fresnel membrane prism compared with glass prism and no prism (p<0.001). Contrast sensitivity also decreased significantly wearing Fresnel membrane prism compared with glass prism and no prism (p<0.05). There were no significant difference between wearing glass prism and no prism in visual acuity and contrast sensitivity. In contrast, RMS value of S3 and S3+S4 aberration wearing glass prism were significantly larger than those in no prism. Wearing Fresnel membrane prism, RMS value of S3, S4 and S3+S4 were also significantly larger than those in no prism.<BR>[Conclusion] These results suggested that wearing glass prism showed less effect on visual function compared with Frsenel membrane prism within a power of 8PD.

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