J Korean Ophthalmol Soc.  2015 Apr;56(4):532-540. 10.3341/jkos.2015.56.4.532.

Analysis of Internal Optical Aberrations in Eyes with Different Types of Cataract

• Han JY
• Eom YS
• Rhim JW
• Kang SY
• Kim HM
• Song JS

• KMID: 2215703
• DOI: http://doi.org/10.3341/jkos.2015.56.4.532

Abstract

PURPOSE
The present study investigates the patterns of internal optical aberrations in eyes with different types of cataract.
METHODS
Eighty eyes of 70 cataract patients were included in the present study. Internal optical aberrations were measured with a KR-1W wavefront aberrometer before cataract operation. Types of cataract were classified into three groups; cortical, nuclear and posterior subcapsular cataracts. The differences in the results of the wavefront data of 6-mm pupil diameter zones were compared among three groups. The Kruskal-Wallis test and Mann-Whitney U test were used for comparing data.
RESULTS
A total of 80 eyes consisting of 30 cortical cataracts, 30 nuclear cataracts and 20 posterior subcapsular cataracts were found. In the 6-mm pupil diameter zone, the average internal spherical aberrations by original value were 0.042 microm of cortical cataracts, -0.092 microm of nuclear cataracts and -0.109 microm of posterior subcapsular cataracts. The average internal spherical aberrations by absolute value were 0.122 microm of cortical cataracts, 0.533 microm of nuclear cataracts and 0.202 microm of posterior subcapsular cataracts. The internal spherical aberrations by original value were not statistically significantly different, but by absolute value were statistically significantly different (p = 0.003, Kruskal-Wallis test). Nuclear cataracts have a much higher positive or negative value than other cataract groups in the distribution of internal spherical aberrations by original value for each type of cataract. Other than this difference, the internal astigmatism and internal high order aberrations were not statistically significantly different.
CONCLUSIONS
The change in internal spherical aberrations of nuclear cataract from the original value was larger than cortical and posterior subcapsular cataract. Therefore, nuclear cataracts have much higher positive or negative values than other cataract groups.

Keyword

Different types of cataract; Internal optical aberrations; Internal spherical aberrations

MeSH Terms

Astigmatism
Cataract*
Humans
Pupil

Figure

• 

  Figure 1. A case of posterior subcapsular cataract that was completely examined all of the aberration data using KR-1W. (A) A slit photo showed a posterior subcapsular cataract (NO1, NC2, C1, P4 in LOCS III score). (B) A photo with retroillumination. (C) The result of KR-1W wavefront aberrometer in this case. Astig = astigmatism; HOA = high order aberrations.

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  Figure 2. The average of internal astigmatism and internal high order aberrations on 6-mm diameter zone. The internal astigmatism and internal high order aberrations were not statistically significantly different except for 4th order high order aberrations ( p = 0.031, Kruskal-Wallis test). Astig = astigmatism; HOA = high order aberrations; CO = cortical opacity; NS = nuclear sclerosis; PSCO = posterior subcapsular opacity. *p < 0.05 based on Kruskal-Wallis test.

• 

  Figure 3. The average of internal spherical aberrations by original value and absolute value on 6-mm diameter zone. SA = spherical aberrations; Absolute = absolute value; Original = original value; CO = cortical opacity; NS = nuclear opacity; PSCO = posterior subcapsular opacity. * p < 0.017 based on Bonferroni-corrected post hoc Mann-Whitney U test. (A) The internal spherical aberrations by original value were not statistically significantly different. (B) The internal spherical aberrations by absolute value were statistically significantly different.

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  Figure 4. The distribution of internal spherical aberrations by original value for each type of cataract.

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  Figure 5. A case of nuclear cataract that had highly negative spherical aberration. The HOA map of ocular wavefront shows a delay of light (cool color) in the central pupillary area. In the color-coded map, cool color represents relatively delayed wavefront and a warm color represents relatively advanced wavefront. (A) A slit photo showed a nuclear cataract (NO4, NC4, C1 in LOCS III score). (B) The result of KR-1W wavefront aberrometer in this case. HOA = high order aberrations.

• 

  Figure 6. A case of nuclear cataract that had highly positive spherical aberration. The HOA map of ocular wavefront shows a delay of light (cool color) in the periphery. (A) A slit photo showed a nuclear cataract (NO5, NC5, C2 in LOCS III score). (B) The result of KR-1W wavefront aberrometer in this case. HOA = high order aberrations.

Reference

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