| A Comparative Study for Mesopic Contrast Sensitivity between Keratectomy(PRK) and Laser in Situ Keratomileusis(LASIK). |
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Jong Bae Jun, Ji Eun Lee, Jong Soo Lee |
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Department of Ophthalmology, Pusan National University, College of Medicine, Pusan, Korea. jongsool@pusan.ac.kr |
| 엑시머레이저 근시교정술에서 밤조건하에서의 대비감도 비교 |
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전종배 ( Jong Bae Jun ) , 이지은 ( Ji Eun Lee ) , 이종수 ( Jong Soo Lee ) |
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| Abstract |
PURPOSE
To compare the effect on visual performance of photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) with mesopic contrast sensitivity using CSV-1000S in excimer laser refractive surgery using the broad beam type and manual microkeratome. METHODS: Postoperative visual performance for 40 eyes undergoing PRK and 40 eyes undergoing LASIK was compared with mesopic contrast sensitivity at 1, 3, and 6 months postoperatively using the CSV 1000 (VectorVision, Ohio, USA). Eyes were divided into two groups: less than 6.0 D and over 6.25 D. Mesopic contrast sensitivity was performed with the patient's uncorrected-visual acuity of 20/20 or better under photopic condition. RESULTS: Under mesopic conditions a significant decrease in contrast sensitivity for the postoperative PRK and LASIK group was obtained at all spatial frequencies compared to the preoperative baseline (p<0.05). At 6 months postoperatively, LASIK decreased mesopic contrast sensitivity significantly more than PRK in myopia below -6.0 D, especially at the middle and high spatial frequencies of 6, 12, and 18 cpd (p<0.05). However, there were not statistically significant differences in mesopic contrast sensitivity between PRK and LASIK in myopia above -6.25 D (p>0.05). CONCLUSIONS: In the broad beam excimer laser, in cases of myopia with below 6.0 D, PRK seemed to have a more significant effect on mesopic contrast sensitivity than LASIK using manual microkeratome at postoperative 6 months. |
| Key Words:
Contrast sensitivity;LASIK;Mesopic condition;PRK |
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