The Effects of Overnight Orthokeratology Lens Wear on Ocular Scatter

Hye Min Jeon; Dong Seob Ahn; Dong Jun Lee; Sang Jeong Moon; Kyung Heon Lee

doi:10.3341/jkos.2014.55.11.1595

Journal List > J Korean Ophthalmol Soc > v.55(11) > 1009826

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Jeon, Ahn, Lee, Moon, and Lee: The Effects of Overnight Orthokeratology Lens Wear on Ocular Scatter

Original Article

J Korean Ophthalmol Soc 2014;55(11):1595-1599.

Published online: 2 September 2014

DOI: https://doi.org/10.3341/jkos.2014.55.11.1595

The Effects of Overnight Orthokeratology Lens Wear on Ocular Scatter

Hye Min Jeon, MD, Dong Seob Ahn, MD, Dong Jun Lee, MD, Sang Jeong Moon, MD, Kyung Heon Lee, MD

Busan Sungmo Eye Hospital, Busan, Korea

Address reprint requests to Sang Jeong Moon, MD, Busan Sungmo Eye Hospital, #409-1 Haeun-daero, Haeundae-gu, Busan 612-823, Korea, Tel: 82-51-743-0775, Fax: 82-51-743-0776, E-mail: pinmed@hanmail.net

Received 26 April 2014 Revised 22 May 2014 Accepted 16 October 2014

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 the change of visual quality after wearing orthokeratology lenses overnight.

Methods

This study included 13 patients (24 eyes) who wore orthokeratology lenses for the first time. Visual quality was assessed with the optical quality analysis system (OQAS) using the double-pass technique. The value of modulation transfer function (MTF) cutoff, Strehl ratio, and objective scatter index (OSI) were measured at baseline and 4 weeks after wearing the lenses.

Results

The mean spherical equivalent decreased from −2.70 ± 1.03 diopters (D) to 0.03 ± 0.36 D after 4 weeks of wearing orthokeratology lenses and uncorrected visual acuity improved from log MAR 0.88 ± 0.17 to log MAR 0.03 ± 0.04. The MTF cutoff decreased from 38.20 ± 11.01 to 34.79 ± 10.30 and the Strehl ratio decreased from 0.24 ± 0.07 to 0.21 ± 0.07 but without statistical significance. The OSI significantly increased from 0.38 ± 0.19 to 0.72 ± 0.40 after wearing orthokeratology lenses.

Conclusions

Orthokeratology lenses were effective for correction of myopia and astigmatism. The OSI increased after wearing the lenses, but MFT cutoff and Strehl ratios were not affected.

Keywords: OQAS, Orthokeratology, Scatter

References

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Table 1.

Demographics of patients

	Patients
N (eyes)	13 (24)
Sex (M/F)	6:7
OD/OS	11:13
Age (years)
Mean ± SD	10.3 ± 6.5
Range	7-31
Follow up period (days)
Mean ± SD	36.5 ± 8.1
Range	27-50

Table 2.

The refractive, keratometric variables, and visual acuity at baseline and 4 weeks after wearing orthokeratology lens

	Baseline	Post-treatment	p-value
Manifest sphere (diopter)	−2.42 ± 0.86	0.20 ± 0.30	<0.001
Manifest cylinder (diopter)	−0.56 ± 0.48	−0.34 ± 0.35	0.044
Spherical equivalent (diopter)	−2.70 ± 1.03	0.03 ± 0.33	<0.001
K^∗_min	43.37 ± 0.99	40.90 ± 1.31	<0.001
K^∗_max	44.50 ± 1.20	42.29 ± 1.22	<0.001
UDVA (log MAR)	0.88 ± 0.17	0.03 ± 0.04	<0.001

Values are presented as mean ± SD.

UDVA = uncorrected distance visual acuity.

^∗ Corneal curvature.

Table 3.

Baseline and post-treatment retinal image-quality results

	Baseline		Post-treatment		p-value
	Mean ± SD	range	Mean ± SD	range	p-value
MTF cutoff (cycles/degree)	38.20 ± 11.02	19.39-55.39	34.79 ± 10.30	19.04-54.61	0.262
Strehl ratio	0.24 ± 0.07	0.12-0.40	0.21 ± 0.07	0.11-0.40	0.115
Width at 50%	3.46 ± 1.15	5.84-2.15	4.03 ± 1.29	6.60-2.26	0.104
Width at 10%	10.22 ± 2.94	17.08-5.82	12.19 ± 4.68	27.04-6.04	0.086
OSI	0.38 ± 0.19	0.10-0.80	0.72 ± 0.40	0.20-1.90	<0.001

MTF = modulation transfer function; OSI = objective scatter index.

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