Objective Clinical Evaluation of Ocular Optical Instrument According to the Type of Lens Opacity

Chang Won Park; Geun Yeong Kim; Hyo Jin Kim; Je Hyung Hwang; Choun-Ki Joo

doi:10.3341/jkos.2014.55.1.79

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Park, Kim, Kim, Hwang, and Joo: Objective Clinical Evaluation of Ocular Optical Instrument According to the Type of Lens Opacity

Original Article

J Korean Ophthalmol Soc 2014;55(1):79-84.

Published online: 7 September 2014

DOI: https://doi.org/10.3341/jkos.2014.55.1.79

Objective Clinical Evaluation of Ocular Optical Instrument According to the Type of Lens Opacity

Chang Won Park, MS¹, Geun Yeong Kim, MD¹, Hyo Jin Kim, PhD^2,³, Je Hyung Hwang, MD¹, Choun-Ki Joo, MD, PhD¹

¹Department of Ophthalmology and Institute for Visual Science College of Medicine The Catholic University of Korea, Seoul, Korea

²Division of Health Science, Baekseok University, Cheonan, Korea

³Graduate School of Health and Welfare, 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 13 July 201329 July 2013 Accepted 20 November 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 investigate the results using the OQAS and the Pentacam in cataract patients classified according to the type of lens opacity.

Methods

The present study included 124 eyes of 92 patients who had cataract surgery at Seoul St. Mary’s Hospital from December 2011 to January 2012 and were classified into nuclear, cortical, and posterior subcapsular cataract patients. The lens opacity was determined with OSI, MTF, Strehl ratio, width 10%, width 50% and the opacity of Scheimpflug image by the OQAS and the Pentacam. Additionally, the correlation between subjective cataract classification and objective opacity value was analyzed.

Results

The nuclear cataract group showed a 6.40 ± 2.41 OSI value and had high opacity. The cortical cataract group showed the highest MTF cut-off value (12.02 ± 6.19 C/deg). When evaluating Pentacam results, the posterior subcapsular cataract group had the lowest average level of lens opacity (9.12 ± 1.08) followed by in increasing order, the cortical cataract group (9.79 ± 1.67) and the nuclear cataract group (11.08 ± 1.84). The results were statistically significant (p < 0.001). The OSI value of the OQAS was significantly correlated with nuclear and posterior opacity (p = 0.049, p = 0.039, re-spectively) except cortical opacity (p = 0.781). MTF and nuclear opacity showed statistically significant correlation and the lens opacity of Pentacam was correlated with nuclear and posterior opacities. In cortical cataract with severe peripheral opacity, the cortical opacity showed significant correlation with Maximum.

Conclusions

The OQAS and Pentacam results showed high correlation with the nuclear and posterior opacities which can be useful for cataract surgery.

Keywords: Cataract, MTF, OQAS, OSI, Pentacam

References

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Figure 1.

A representative OQAS (optical quality analysis system), Pentacam of results from a patient.

Table 1.

Demographics of patients

Characteristics	Total	Nuclear cataract	Cortical cataract	Posterior cataract
Patients (eyes)	92 (124)	36 (50)	29 (40)	27 (34)
Age ± SD (years)	64.29 ± 12.55	69.08 ± 9.45	62.55 ± 8.36	59.39 ± 13.48
Sex
Male (n)	48	20	14	14
Female (n)	44	16	15	13
Pre operation	-0.42 ± 2.77	-0.56 ± 2.86	-0.21 ± 2.06	-0.45 ± 1.85
Spherical equivalent (diopter)
Pre operation	-1.38 ± 1.27	-1.01 ± 1.02	-1.33 ± 1.98	-1.47 ± 1.22
Cylinder (diopter)

Values are presented as mean ± SD.

CDVA = corrected distance visual acuity.

Table 2.

Results of OQAS, Pentacam performed on cataract patients classified as lens opacity

Cataract patients	(n)	OQAS’ parameter					Pentacam’ parameter
Cataract patients	(n)	OSI	MTF	Strehl	Width 50%	Width 10%	Pentacam Avg.	Pentacam Maximum
Nuclear cataract	50	6.40 ± 2.41	9.38 ± 7.24	0.19 ± 0.03	10.67 ± 5.46	36.51 ± 19.76	11.08 ± 1.84	18.51 ± 8.06
Cortical cataract	40	4.45 ± 2.40	12.02 ± 6.19	0.14 ± 0.19	11.26 ± 6.84	35.45 ± 24.80	9.79 ± 1.67	21.63 ± 14.54
PSO cataract	34	5.42 ± 2.55	10.15 ± 5.98	0.15 ± 0.22	13.36 ± 8.43	28.03 ± 24.69	9.12 ± 1.08	18.74 ± 9.07
p-value		^* p < 0.001	^* p < 0.001	p = 0.215	p = 0.341	p = 0.368	^* p < 0.001	p = 0.609

Values are presented as mean ± SD.

OQAS = optical quality analysis system; PSO = posterior subcapsular opacity.

By ANOVA test, ^* p < 0.05.

Table 3.

The correlation coeffient between the objective index parameters and Lens morphology

Lens morphology	OSI (OSI value)	MTF (C/deg)	Strehl ratio	Width 50%	Width 10%	Pentacam Avg.	Pentacam Maximum
Nuclear opacity grade	0.229^†	-0.271	-0.04	-0.201	0.128	0.249	-0.133
	0.049^*,‡	0.019^*	-0.735	0.085	0.277	0.029^*	0.249
Cortical opacity grade	-0.033	-0.056	-0.028	0.031	0.037	0.071	0.313
	0.781	0.633	0.814	0.796	0.756	0.540	0.006^*
PSO grade	0.241	-0.077	0.172	0.072	0.088	0.236	-0.010
	0.039^*	0.514	0.143	0.544	0.454	0.039^*	0.931

OSI = objective scattering index; MTF = modulation transfer function; PSO = posterior subcapsular opacity.

Pearson correlation test, ^* p < 0.05; ^† Correlation coefficient; ^‡ p-value.

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