Changes in Straylight by Cataract Type Before and After Cataract Surgery

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  • 白内障手術前後における白内障混濁別の散乱光の変化

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[Purpose] To study straylight by patient's cataract type and changes in straylight before and after cataract surgery.<br>[Subjects and Methods] Subjects were 50 eyes of 38 patients who underwent cataract surgery at Toyama University Hospital between April and September 2014. Straylight was measured before and after the surgery with the C-Quant Straylight Meter. The subjects' cataracts were classified into four subtypes: nuclear, cortical, posterior subcapsular and retrodots cataract (nuclear cataract 16 eyes, cortical cataract 27 eyes, posterior subcapsular cataract 7 eyes, retrodots was 39 eyes). Correlations of the straylight value with the degree of lens opacity, preoperative visual acuity, and higher-order aberrations, and the changes in the straylight values before and after the cataract surgery were examined for the four cataract types. <br>[Results] A significant correlation between the degree of opacity and the straylight value was observed in nuclear and cortical cataract (P < 0.01) but not in retrodots. Preoperative visual acuity and the RMS values for the higher-order aberrations did not correlate with the straylight value in nuclear and cortical cataract. The straylight value significantly decreased after surgery in nuclear and cortical cataract (P < 0.01). Among the four types, posterior subcapsular cataract had the highest preoperative straylight value although statistical analysis could not be performed due to insufficient number of subjects in this type.<br>[Conclusion] The straylight value according to patient's degree of lens opacity and cataract type was investigated. In nuclear and cortical cataract, the straylight value increased with the degree of opacity and decreased after cataract surgery. Among the four types, posterior subcapsular cataract had the highest straylight value. Assessment of straylight may be useful for the management of cataract and can be used to evaluate clearness of vision besides visual acuity.

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