Vision function of pseudophakic eyes with posterior capsular opacification under different speed and spatial frequency
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ORIGINAL PAPER
Vision function of pseudophakic eyes with posterior capsular opacification under different speed and spatial frequency Ziyuan Liu . Zhiqiang Hou
. Shan Ge . Honglei Pang . Wei Wang
Received: 18 February 2020 / Accepted: 25 July 2020 Ó Springer Nature B.V. 2020
Abstract Purpose To investigate the characteristics of dynamic visual acuity (DVA) and contrast sensitivity (CS) in pseudophakic patients with posterior capsular opacification (PCO). Methods Fifty-four eyes (36 patients) with PCO planned for laser capsulotomy were recruited. They underwent examinations of static visual acuity (SVA), DVA, CS and optical quality analysis (OQAS) before and one week after the laser treatment. Improvements in each index after laser treatment were analyzed. The visual quality of patients with good initial vision was studied separately. Results SVA, DVA and CS all significantly increased after capsulotomy (P \ 0.05). Postoperative improvements in DVA were higher than in SVA, but they decreased when the speed increased. DVA at 15 dps gained the most improvement after capsulotomy. DVA at all analyzed speeds was significantly lower than SVA (P = 0.000). There was a significant speeddependent decrease in DVA at lower speeds compared with higher speeds. The postoperative improvements
Ziyuan Liu and Zhiqiang Hou contributed equally to the work. Z. Liu Z. Hou (&) S. Ge H. Pang W. Wang Department of Ophthalmology, Peking University Third Hospital, Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, 49 North Garden Road, Haidian District, Beijing 100191, China e-mail: [email protected]
in CS decreased when the spatial frequency was increased. The CS at the lower frequencies of 3 cpd and 6 cpd was the most improved after capsulotomy. CS was much lower at high frequencies (p \ 0.05). There was a significant decrease in CS at higher spatial frequencies compared with lower frequencies. DVA improvements were correlated with CS improvements at medium spatial frequencies and with objective scattering index and Strehl ratio. The CS at all frequencies significantly improved for patients with good initial vision. Conclusion PCO could impair dynamic vision function, but CS was a more sensitive indication of visual complaints in patients with slight PCO. Keywords Posterior capsular opacification Dynamic visual acuity Static visual acuity Contrast sensitivity
Introduction Cataracts can cause suffering in people of any age, and senile cataracts are the most common type [12, 18, 27]. Advances in technology have brought cataract surgery to a new era of refraction restoration [31]. Perfect vision after cataract extraction and intraocular lens (IOL) implantation can help patients adjust well back into daily life. Therefore, people are willing to
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undergo surgery at a relatively younger age, and there is a growing population with pseudophakic eyes who are living vigorous lives, such as performing sports, driving and being active at work, whic
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