J Korean Ophthalmol Soc.  2014 May;55(5):656-661. 10.3341/jkos.2014.55.5.656.

Comparison of Anterior Segment Measurements Using Scanning-Slit Topography and Optical Low-Coherence Reflectometry (OLCR) Biometry

• Rhee TK
• Park JH
• Kang HJ
• Kwon YA
• Song SW
• Kim BY
• Chung JL

• KMID: 2218085
• DOI: http://doi.org/10.3341/jkos.2014.55.5.656

Abstract

PURPOSE
To compare the results of anterior segment biometry including white-to-white (WTW) between scanning-slit topography (ORBscan IIz(R), Bausch & Lomb), optical low-coherence reflectometry (OLCR) biometry (Lenstar(R), Haag-Streit), and Castroviejo calipers.
METHODS
Measurements on 72 eyes of 36 patients that underwent refractive surgery were measured using ORBscan(R), Lenstar(R), and calipers and compared. Ocular biometry parameters used in this study included the WTW, central corneal thickness, anterior chamber depth (ACD), keratometry, and pupil size.
RESULTS
The WTW measurements using ORBscan(R) and calipers (11.57 +/- 0.35 mm and 11.58 +/- 0.34 mm, respectively) were statistically similar. However, the measurement using Lenstar(R) (12.05 +/- 0.40 mm) was significantly greater than with the other methods (p < 0.001). Central corneal thickness and keratometry measurements using ORBscan(R) were greater than when using Lenstar(R) (p = 0.01 for both). ACD and pupil size measurement using Lenstar(R) were greater than when using ORBscan(R) (p < 0.001 for both).
CONCLUSIONS
Because WTW and ACD measurements using Lenstar(R) were greater than when using ORBscan(R) and calipers, unexpected high-vaulting may be observed due to the selection of a larger-sized posterior chamber phakic intraocular lens. Therefore, the differences in measurements obtained when using these methods should be considered.

Keyword

Biometry; Lenstar(R); Optical low-coherence reflectometry (OLCR); ORBscan(R); White-to-white (WTW)

MeSH Terms

Anterior Chamber
Biometry*
Humans
Phakic Intraocular Lenses
Pupil
Refractive Surgical Procedures

Figure

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  Figure 1. Comparison of the white to white measurements between the ORBscan®, Lenstar®, and caliper. Measurements by ORBscan® and caliper were 11.57 ± 0.35 mm, 11.58 ± 0.34 mm respectively, and Lenstar®, which was 12.05 ± 0.40 mm measured significantly larger (p < 0.001).

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  Figure 2. Bland-Altman plots of agreement between Lenstar® against ORBscan® biometry measurements. The solid line indicates the mean difference (bias). The upper and lower lines represent the 95% LoA. Results show that the observed differences in each measurement were unrelated to the mean difference. ACD = anterior chamber depth; CCT = central corneal thickness; K = keratometry; LoA = limits of agreement.

Reference

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