Internal Lens Signal Measured by Dual Scheimpflug Anterior Segment Analyzer

Jin Woo Ro; Ka Young Yi; Ha Kyung Kim; Joon Young Hyon; Won Ryang Wee; Young Joo Shin

doi:10.7469/JKOS.2015.56.05.702

Journal List > J Korean Ophthalmol Soc > v.56(5) > 1010270

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Ro, Yi, Kim, Hyon, Wee, and Shin: Internal Lens Signal Measured by Dual Scheimpflug Anterior Segment Analyzer

Original Article

J Korean Ophthalmol Soc 2015;56(5):702-708.

Published online: 7 September 2015

DOI: https://doi.org/10.7469/JKOS.2015.56.05.702

Internal Lens Signal Measured by Dual Scheimpflug Anterior Segment Analyzer

Jin Woo Ro, MD¹, Ka Young Yi, MD, PhD¹, Ha Kyung Kim, MD, PhD¹, Joon Young Hyon, MD, PhD^2,³, Won Ryang Wee, MD, PhD³, Young Joo Shin, MD, PhD¹

¹Department of Ophthalmology, Hallym University College of Medicine¹, Chuncheon, Korea

²Department of Ophthalmology, Seoul National University Bundang Hospital, Seoul National University College of Medicine², Seongnam, Korea

³Department of Ophthalmology, Seoul National University College of Medicine³, Seoul, Korea

￭ Address reprint requests to Young Joo Shin, MD, PhD Department of Ophthalmology, Hallym University Kangnam Sacred Heart Hospital, #1 Singil-ro, Yeongdeungpo-gu, Seoul 150-950, Korea Tel: 82-2-829-5193, Fax: 82-2-848-4638 E-mail: schinn@daum.net

Received 8 November 20146 January 2015 Accepted 20 April 2015

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.

초록

Purpose:

To investigate the clinical significance of the internal lens signal measured using dual Scheimpflug anterior segment analyzer (Galilei ^TM, Ziemer, Switzerland) in patients receiving cataract surgery.

Methods:

The present study included 151 eyes of 148 patients who received surgery for senile cataracts from February 2012 to January 2013. Preoperative internal lens signals were measured preoperatively. The depth of anterior chamber and anterior angles were measured using dual Scheimpflug anterior segment analyzer preoperatively and 1 month postoperatively. Preoperative and postoperative best-corrected visual acuities (BCVAs) were measured. The relationships between preoperative internal lens signal and the changes in BCVA or anterior angles were evaluated.

Results:

Internal lens signal and preoperative BCVA (log MAR) or preoperative anterior chamber depth were highly correlated (r = 0.287, p = 0.001 and r = -0.271, p = 0.004, respectively). Anterior angles increased 1 month after surgery compared with the preoperative values ( p < 0.001). The amount of change between preoperative and postoperative anterior angles correlated with preoperative anterior angles ( p < 0.001). However, no statistically significant correlation was observed between internal lens signal and preoperative anterior angles or postoperative BCVA. Internal lens signal correlated with changes in postoperative anterior angles ( p < 0.001).

Conclusions:

Internal lens signal correlated with preoperative visual acuity and may help evaluate the cataract severity quantita-tively and objectively. Internal lens signal may aid in understanding the structure of anterior segments by predicting the lens volume. Knowing the effect of visual impairment due to cataracts and predicting visual improvement after cataract surgery is necessary.

Keywords: Cataract surgery, Dual Scheimpflug anterior segment analyzer, Internal lens signal, Visual acuity

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Figure 1.

Internal intensity of the lens using dual Scheimpflug camera. Internal intensity was decided as the value at the high-est intensity.

Figure 2.

Internal lens signal and preoperative visual acuity, postoperative visual acuity, difference between preoperative visual acuity and postoperative visual acuity, or anterior chamber depth. Visual acuity was expressed as log MAR. AC = anterior chamber.

Figure 3.

(A) Difference between preoperative and postoperative anterior chamber angle. (B) The relationship between preoperative anterior chamber angle and internal lens intensity. (C) The relationship between anterior chamber angles and the difference of anterior chamber angles. Preop = preoperative; Postop = postoperative. ^* Statistically significant by Wilcoxon rank test.

Table 1.

Preoperative and postoperative data

	Preoperative	One month postoperative
Internal lens intensity	42.7 ± 23.0
Corrective visual acuity (log MAR)	0.58 ± 0.37	0.23 ± 0.24
Anterior angle (°)
Superior	34.0 ± 6.9	40.9 ± 4.3^*
Inferior	39.5 ± 7.2	46.4 ± 5.0^*
Nasal	33.3 ± 5.3	40.3 ± 3.1^*
Temporal	32.3 ± 5.2	38.4 ± 3.6^*
Intraocular pressure (mm Hg)	15.3 ± 3.0	14.2 ± 3.3
Anterior chamber depth (mm)	2.64 ± 0.37	3.29 ± 0.31^*

Values are presented as mean ± SD.

^* Statistically significant by Wilcoxon rank test.

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