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Journal List > J Korean Ophthalmol Soc > v.54(8) > 1009448

Park, Lee, and Joo: Changes in Optical Quality of Cataract Patients’ Corrected Visual Acuity before and after Phacoemulsification

Abstract

Purpose

To evaluate objectively the improvement level of a patient’s visual function using the NEI-VFQ-25 questionnaire pre- and post-operatively and the OQAS results from the patient group who had the same corrected visual acuity pre- and post-operatively.

Methods

We examined and compared the NEI-VFQ-25 test, OSI, MTF cut-off, strehl ratio, OQAS, and width at 50% and 10% in 24 eyes of 24 patients who had cataract surgery between December 2011 and February 2012. The patients’ cor-rected visual acuity in both eyes had no change (0.8 and 0.8) pre-operatively and 2 months post-operatively (1.0 and 1.0).

Results

The satisfaction level regarding the patients’ visual function increased. The NEI-VFQ-25 test was 71.54 ± 14.88 points pre-operatively and 85.70 ± 6.17 points post-operatively. OSI decreased to 3.13 ± 1.66 (OSI value) and 1.53 ± 0.58 (OSI value), and MTF cut off value improved from 14.51 ± 6.97 (C/deg) to 27.63 ± 8.98 (C/deg). Strehl ratio was improved to 0.09 ± 0.03 and 0.14 ± 0.03, width at 50% improved to 8.44 ± 3.73 and 4.52 ± 1.90 and width at 10% improved to 35.30 ± 15.22 and 18.04 ± 8.87 pre- and post-operatively, respectively.

Conclusions

The NEI-VFQ-25 test reflected the vision improvement in patients where after cataract surgery, determi-nation of the visual function improvement only through vision would not be possible. In addition, the OQAS showed the quality of vision improved through quantified values.

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References

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jkos-54-1208f1.tif
Figure 1.
Illustration of a double-pass system
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jkos-54-1208f2.tif
Figure 2.
Modulation transfer function.
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jkos-54-1208f3.tif
Figure 3.
A representative OQAS result of a patient.
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Table 1.
Demographics of patients
Characteristics 0.8⟶0.8 CDVA group 1.0⟶1.0 CDVA group Total
Eye (n) 14 10 24
Age ± SD (years) 62.23 ± 9.27 57.63 ± 9.92 60.39 ± 9.64
Sex
Male (n) 5 6 11
Female (n) 9 4 13
Pre operative SE 0.19 ± 2.27 -0.16 ± 2.41 0.04 ± 2.28
Pre operative cylinder -1.06 ± 0.45 -1.08 ± 0.89 -1.07 ± 0.66

Values are presented as mean ± SD.

CDVA = corrected distance visual acuity; SE = spherical equivalent.

Table 2.
OQAS parameters before and after cataract surgery (n = 24)
Parameter Pre operation Post operation p-value
OSI (OSI value) 3.13 ± 1.66 1.53 ± 0.58 0.000*
MTF cut-off (C/deg) 14.51 ± 6.97 27.63 ± 8.98 0.000*
Strehl ratio 0.09 ± 0.03 0.14 ± 0.03 0.000*
Width at 50% 8.44 ± 3.73 4.52 ± 1.90 0.000*
Width at 10% 35.30 ± 15.22 18.04 ± 8.87 0.000*
NEI-VFQ-25 (score) 71.54 ± 14.88 85.70 ± 6.17 0.002*

Values are presented as mean ± SD.

OSI = objective scatter index; MTF = modulation transfer function; NEI-VFQ-25 = National Eye Institute Visual Function Questionnaire 25.

* p < 0.01 significantly different from each group compaired.

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