Changes in Visual Field Index After Cataract Extraction

Sohee Jeon; Jeong Hoon Choi; Ji Wook Yang; Young Chun Lee; Su Young Kim

doi:10.3341/jkos.2010.51.3.386

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Jeon, Choi, Yang, Lee, and Kim: Changes in Visual Field Index After Cataract Extraction

Original Article

J Korean Ophthalmol Soc 2010;51(3):386-392.

Published online: 25 September 2010

DOI: https://doi.org/10.3341/jkos.2010.51.3.386

Changes in Visual Field Index After Cataract Extraction

Sohee Jeon, MD, Jeong Hoon Choi, Ji Wook Yang, MD, Young Chun Lee, MD, Su Young Kim, MD

Department of Ophthalmology and Visual Science, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea

Address reprint requests to Su Young Kim, MD, Department of Ophthalmology, Uijeongbu St. Mary's Hospital, The Catholic University of Korea #65-1 Geumoh-dong, Uijeongbu 480-717, Korea Tel: 82-31-820-3587, Fax: 82-31-847-3418, E-mail: cassiopeia-su@hanmail.net

Received 37 July 2009 Accepted 10 November 2009

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 changes of visual field index (VFI) compared with mean deviation (MD) and pattern standard deviation (PSD) before and after cataract surgery.

Methods

The present study included 77 eyes of 77 patients who were diagnosed with both glaucoma and cataracts and underwent cataract surgery. Preoperative and postoperative VFI, MD, and PSD were examined. Lens opacity type was classified as cortical, nucleosclerosis, or posterior subcapsular opacity (PSCO), and the MD, PSD, and VFI were compared before and after cataract surgery.

Results

Preoperative and postoperative MD were −13.64±8.97, −11.94±9.67(p=0.113), PSD were 6.18±3.30, 5.91±3.31(p=0.344), and VFI were 67.00±33.43, 70.55±33.19(p=0.440), respectively. MD showed statistically significant difference in cortical and PSCO type before and after cataract surgery. PSD (p=0.025) and VFI (p=0.020) showed a statistically significant difference in cortical type.

Conclusions

VFI is an effective parameter to monitor the progression of glaucoma in cataract patients with nucleosclerosis and PSCO, but has limitations in cataract patients with cortical opacity.

Keywords: Cataract, Glaucoma, Visual Field Index

References

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Figure 1.

(A) 24–2 Visual field examination, 3 months before cataract surgery (MD=-6.52dB, PSD=9.09dB, VFI: 82%). (B) 24–2 Visual field examintion, 4 months after cataract surgery showing much better test results (MD= −5.07dB, PSD=4.45dB, VFI=91%).

Figure 2.

Correlation between MD and VFI. MD and VFI showed positive correlation which is statistically significant (R²=0.96, p<0.005) (MD=mean deviation, VFI=visual field index).

Figure 3.

Correlation between PSD and VFI. PSD and VFI showed negative correlation which is statistically significant (R²=0.341, p<0.005). (PSD=pattern standard deviation, VFI=visual field index).

Figure 4.

Correlation between difference in visual acuity and difference in VFI. Improvement of postoperative visual acuity was not related to difference in VFI (R²=0.002, p=0.68). (BCVA=best corrected visual acuity, VFI=visual field index).

Table 1.

Characteristics of the subset of patients

Age at the time of cataract surgery (years)
	Mean± SD	72.27±9.23
	Range	49–87
Sex	Male	30 (38.9%)
	Female	47 (61.1%)
Eye	Right	38 (49.4%)
	Left	39 (50.6%)
Visual field exam interval before cataract surgery (mean± SD, months)		3.18±1.9
Visual field exam interval after cataract surgery (mean± SD, months)		4.70±1.4
IOP before cataract surgery (mean± SD, mmHg)		16.14±3.8^*
IOP after cataract surgery (mean± SD, mmHg)		13.92±3.2^*

^* p=0.16; Paired t test (for comparison of IOP before and after cataract surgery).

Table 2.

Visual field characteristics, visual acuity

		Before surgery	After surgery	Difference (%)	p-value
Visual acuity (mean± SD)		0.36±0.22	0.79±0.26		<0.005
	Cortical type	0.43±0.22	0.81±0.28		<0.005
	Nucleosclerotic type	0.32±0.15	0.74±0.20		<0.005
	Post. Subcapsular type	0.25±0.23	0.85±0.26		<0.005
MD (mean± SD) dB		‐13.64±8.97	‐11.94±9.67	12.46	0.113
	Cortical type	‐11.21±8.09	‐9.58±8.99	14.54	0.004
	Nucleosclerotic type	‐13.05±6.74	‐11.33±8.34	13.18	0.102
	Post. Subcapsular type	‐17.05±10.07	‐15.25±10.42	10.55	0.029
PSD (mean± SD) dB		6.18±3.30	5.91±3.31	4.36	0.344
	Cortical type	5.59±2.83	4.62±2.62	17.35	0.025
	Nucleosclerotic type	5.96±4.03	5.84±2.98	2.01	0.616
	Post. Subcapsular type	7.06±3.43	7.63±3.56	7.93	0.198
VFI (mea± SD) %		67.00±33.43	70.55±33.19	5.29	0.440
	Cortical type	77.71±27.97	81.19±28.14	8.06	0.020
	Nucleosclerotic type	52.21±37.29	56.42±35.95	4.47	0.345
	Post. Subcapsular type	60.62±31.97	62.87±33.77	3.71	0.622

Paired T-test was used to check the statistics; Difference was calculated from |(result of before surgery-after surgery) / result of before surgery|.

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