Accuracy of Biometry and Intraocular Lens Power Calculation With Partial Coherence Interferometry in High Myopia

Jun Min; Yeon Kang Soo; Yeop Kim Byoung

doi:10.3341/jkos.2008.49.11.1746

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Min, Soo, and Byoung: Accuracy of Biometry and Intraocular Lens Power Calculation With Partial Coherence Interferometry in High Myopia

Original Article

J Korean Ophthalmol Soc 2008;49(11):1746-1751.

Published online: 7 September 2008

DOI: https://doi.org/10.3341/jkos.2008.49.11.1746

Accuracy of Biometry and Intraocular Lens Power Calculation With Partial Coherence Interferometry in High Myopia

Jun Min, M.D.¹, Yeon Kang Soo, M.D.², Yeop Kim Byoung, M.D.^2,

¹Department of Ophthalmology, School of Medicine, Ewha Womans University, Seoul, Korea

²Department of Ophthalmology, Kim's Eye Hospital, Myung-gok Ophthalmologic Research Center, Seoul, Korea

Address reprint requests to Byoung Yeop Kim, M.D. Department of Ophthalmology, Kim's Eye Hospital #156 4ga, Yeoungdeungpo-dong, Yeoungdeungpo-gu, Seoul 150-034, Korea Tel: 82-2-2639-7777, Fax: 82-2-2633-3976, E-mail: yeopk@konyang.ac.kr

Received 22 July 2008 Accepted 28 February 2008

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 accuracy of biometry and intraocular lens (IOL) power calculation using partial coherence interferometry (IOL Master^®) in highly myopic patients with axial lengths of 26 mm or greater.

Methods

Patients with axial lengths equal to or greater than 26 mm who had undergone cataract surgery were enrolled. IOL power was calculated using IOL Master and/or applanation ultrasonography with the SRK/T formula. Twenty-seven eyes using both IOL Master and applanation ultrasonography were included in a paired group, and forty-eight eyes using the IOL Master only and twenty-five eyes using applanation ultrasonography only were included in unpaired groups. The differences between the predicted refraction and the actual refraction were compared and analyzed.

Results

In the paired study, the axial lengths in patients using IOL Master (29.14±2.32 mm) were significantly longer than those of patients using applanation ultrasonography (28.57±2.23 mm) ( p<0.05). The mean absolute error (MAE) of the IOL Master and applanation ultrasonography groups were 0.62±0.58D and 0.87±0.49D, respectively ( p>0.05). In the unpaired study, the MAEs of the IOL Master and applanation ultrasonography groups were 0.61±0.61D and 0.65±0.63D, respectively.

Conclusions

In eyes with axial lengths of 26.0 mm or greater, the accuracy of IOL power calculation with IOL Master using the SRK/T formula was comparable to that with applanation ultrasonography.

Keywords: High myopia, IOL calculation, IOL Master

References

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Figure 1.

(A) Correlation between axial lengths measured by the IOL Master and ultrasound with correlation coefficient of 0.99, P<0.001. (B) Correlation between the axial length and differences of axial length measured by the two methods with correlation coefficient of 0.60, P<0.05.

Figure 2.

(A) Mean absolute error in paired group. (B) Mean absolute error in unpaired group.

Table 1.

Patient characteristics

Parameters	Paired group	Unpaired group
Parameters	Paired group	IOL Master	Ultrasound
No. of eyes (patients)	27 (19)	47 (38)	25 (20)
Sex (Male/Female)	5/14	19/19	10/10
Mean age	57.00±10.80	54.87±12.03	54.82±10.32
Preoperative SE^* (D)	-13.08±5.83	-10.76±5.06	-8.76±4.83

^* Spherical equivalent.

Table 2.

Comparison of IOL Master and applanation ultrasonography in refractive outcomes

Error	Paired group		Unpaired group
Error	IOL Master	Ultrasound	IOL Master	Ultrasound
MNE^* (D)	+0.34±0.78	-0.87±0.49	+0.13±0.85	-0.46±0.79
MAE^†(D)	0.62±0.58	0.87±0.49	0.61±0.61	0.65±0.63

^* Mean numeric error

^† Mean absolute error.

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