Chang Won Park; Yong Eun Lee; Choun-Ki Joo

doi:10.3341/jkos.2013.54.8.1208

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Park, Lee, and Joo: Changes in Optical Quality of Cataract Patients’ Corrected Visual Acuity before and after Phacoemulsification

Original Article

J Korean Ophthalmol Soc 2013;54(8):1208-1212.

Published online: 7 September 2013

DOI: https://doi.org/10.3341/jkos.2013.54.8.1208

Changes in Optical Quality of Cataract Patients’ Corrected Visual Acuity before and after Phacoemulsification

Chang Won Park, MS, Yong Eun Lee, MD, Choun-Ki Joo, MD, PhD

Department of Ophthalmology and Institute for Visual Science College of Medicine, The Catholic University of Korea, Seoul, Korea

Address reprint requests to Choun-Ki Joo, MD, PhD Department of Ophthalmology, Seoul St. Mary’s Hospital, The Catholic University of Korea, #222 Banpo-daero, Seocho-gu, Seoul 137-701, Korea Tel: 82-2-2258-7621, Fax: 82-2-599-7405 E-mail: ckjoo@catholic.ac.kr

Received 8 March 20136 April 2013 Accepted 1 June 2013

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To evaluate objectively the improvement level of a patient’s visual function using the NEI-VFQ-25 questionnaire pre- and post-operatively and the OQAS results from the patient group who had the same corrected visual acuity pre- and post-operatively.

Methods

We examined and compared the NEI-VFQ-25 test, OSI, MTF cut-off, strehl ratio, OQAS, and width at 50% and 10% in 24 eyes of 24 patients who had cataract surgery between December 2011 and February 2012. The patients’ cor-rected visual acuity in both eyes had no change (0.8 and 0.8) pre-operatively and 2 months post-operatively (1.0 and 1.0).

Results

The satisfaction level regarding the patients’ visual function increased. The NEI-VFQ-25 test was 71.54 ± 14.88 points pre-operatively and 85.70 ± 6.17 points post-operatively. OSI decreased to 3.13 ± 1.66 (OSI value) and 1.53 ± 0.58 (OSI value), and MTF cut off value improved from 14.51 ± 6.97 (C/deg) to 27.63 ± 8.98 (C/deg). Strehl ratio was improved to 0.09 ± 0.03 and 0.14 ± 0.03, width at 50% improved to 8.44 ± 3.73 and 4.52 ± 1.90 and width at 10% improved to 35.30 ± 15.22 and 18.04 ± 8.87 pre- and post-operatively, respectively.

Conclusions

The NEI-VFQ-25 test reflected the vision improvement in patients where after cataract surgery, determi-nation of the visual function improvement only through vision would not be possible. In addition, the OQAS showed the quality of vision improved through quantified values.

Keywords: Cataract surgery, MTF, NEI-VFQ-25, OQAS, OSI

References

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Figure 1.

Illustration of a double-pass system

Figure 2.

Modulation transfer function.

Figure 3.

A representative OQAS result of a patient.

Table 1.

Demographics of patients

Characteristics	0.8⟶0.8 CDVA group	1.0⟶1.0 CDVA group	Total
Eye (n)	14	10	24
Age ± SD (years)	62.23 ± 9.27	57.63 ± 9.92	60.39 ± 9.64
Sex
Male (n)	5	6	11
Female (n)	9	4	13
Pre operative SE	0.19 ± 2.27	-0.16 ± 2.41	0.04 ± 2.28
Pre operative cylinder	-1.06 ± 0.45	-1.08 ± 0.89	-1.07 ± 0.66

Values are presented as mean ± SD.

CDVA = corrected distance visual acuity; SE = spherical equivalent.

Table 2.

OQAS parameters before and after cataract surgery (n = 24)

Parameter	Pre operation	Post operation	p-value
OSI (OSI value)	3.13 ± 1.66	1.53 ± 0.58	0.000^*
MTF cut-off (C/deg)	14.51 ± 6.97	27.63 ± 8.98	0.000^*
Strehl ratio	0.09 ± 0.03	0.14 ± 0.03	0.000^*
Width at 50%	8.44 ± 3.73	4.52 ± 1.90	0.000^*
Width at 10%	35.30 ± 15.22	18.04 ± 8.87	0.000^*
NEI-VFQ-25 (score)	71.54 ± 14.88	85.70 ± 6.17	0.002^*

Values are presented as mean ± SD.

OSI = objective scatter index; MTF = modulation transfer function; NEI-VFQ-25 = National Eye Institute Visual Function Questionnaire 25.

^* p < 0.01 significantly different from each group compaired.

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