Near Point of Accommodation and Convergence after Photorefractive Keratectomy (PRK) for Myopia.

Binocular vision & strabology quarterly, Simms-Romano's Pub Date : 2013-01-01

Hassancourtney Hashemi, Behnaz Samet, Ali Mirzajani, Mehdi Khabazkhoob, Bijan Rezvan, Ebrahim Jafarzadehpur

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Abstract

Purpose: Near point of convergence (NPC) and near point of accommodation (NPA) were evaluated before and after photorefractive keratectomy (PRK) in normal myopic eyes.

Methods: In this prospective cross sectional study, NPC and NPA were measured in 120 myopic eyes (60 patients) before and 3 months after PRK. Excluding criteria were manifest tropia, previous eye surgery, amblyopia, and any other ocular pathology. All subjects were younger than35 years old.

Results: Fifty-one females (85%) and nine males (15%) participated in the study. The average age of the participants was 25.75 years. Before the operation, the average NPC and NPA were 4.35 cm and 6.9 cm (14.5 D), respectively. NPC and NPA increased significantly 5.63 (p = 0.025) and (p 0.05) to 7.983 cm (12.5 D) (p 0.001), respectively, after 3 months.

Conclusion: NPC and NPA may increase significantly after PRK. Convergence and accommodation problems may affect near visual performance. Therefore, for any PRK candidate, accommodation and convergence should be evaluated.

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屈光性角膜切除术(PRK)治疗近视后的近调节点和会聚点。

目的:评价正常近视患者光屈光性角膜切除术(PRK)前后的近会聚点(NPC)和近调节点(NPA)。方法:在本前瞻性横断面研究中，测量120只近视眼(60例)在PRK前和PRK后3个月的NPC和NPA。排除标准是明显的斜视，以前的眼部手术，弱视和任何其他眼部病理。所有受试者年龄均小于35岁。结果:51名女性(85%)和9名男性(15%)参与了研究。参与者的平均年龄为25.75岁。术前鼻咽癌和NPA平均分别为4.35 cm和6.9 cm (14.5 D)。3个月后，NPC和NPA分别增加5.63 (p = 0.025)和(p 0.05)至7.983 cm (12.5 D) (p 0.001)。结论:PRK后NPC和NPA明显增高。收敛和调节问题可能影响近视表现。因此，对于任何PRK候选人，都应该评估迁就性和收敛性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Binocular vision & strabology quarterly, Simms-Romano's

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