Efficacy of the computer program to compensate color vision deficiency using Seohan computerized 85h

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Efficacy of the computer program to compensate
color vision deficiency using Seohan computerized
85-hue test

• Shin YJ1,2, Park KH2, Hwang JM2, Wee WR2, Lee
  JH2, Lee IB3, Yang SJ4, Ro YM4 Department of
  Ophthalmology, Dongguk University1,
• Department of Ophthalmology, Seoul National
  University2, Department of Bioengineering, Seoul
  National University3,
• Information and Communication University4, Korea

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Background

• Modeling in color vision anomaly

Characteristics of protanomalous L' cone cell
severity 0.1 0.9
Characteristics of deuteranomalous M' cone cell
severity 0.1 0.9
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Purpose
To study the utility of the program that
diagnoses color defects and compensates colors
of computer monitor according to severity and
type in color vision deficiency (CVD)
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Methods

• Congenital CVDs
• Twenty eight patients with congenital CVDs
• No ocular disease
• Color defect () by Ishihara test
• Typical FHx()
• Snellen visual acuity gt 20/40, well cooperated
• Exclusion criteria
• To exclude other factors affecting the color
  vision for the test study of the SCCT,
• the persons who have central nervous system
  disease, take medicine, have organic ophthalmic
  disease that can influence the color vision, and
  the children who are under 6 years old and cannot
  cooperate well in doing the test were excluded.

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Color vision test

• To determine the type and severity of color
  vision defect
• Hardy Rand and Rittler (HRR) test
• Nagel anomaloscope
• Seohan computerized 85-hue test
• Seohan computerized 85-hue test
• Type classification central axis
• Protanomaly 22-33 or 64-72
• Deuteranomaly 15-24 or 58-64
• Tetranomaly 46-52
• Severity classification (Kim et al , 2000)
  total error scores (TES)
• Mild 41-120
• Moderate 121-160
• Severe gt161

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Seohan computerized 85-hue test

• Color compensated program
• Original Seohan computerized hue test
• Color compensated Seohan computerized hue test
• 0.1, 0.3, 0.5, 0.7, 0.9 of 5 steps
• Compare TESs The relation between results of
  Seohan computerized hue test and degrees of color
  compensation was investigated.
• Displacement of central axis, and reduction of
  central axis height

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Results

• Patients
• Total 56 eyes of 28 patients, M F 26 2
• Mean 23.6 years (15-33)
• Type and severity of color vision defect
• Type
• Protanomaly 11 patients
• Deuteranomay 17 patients
• Severity
• Mild 11 patients
• Moderate 5 patients
• Severe 12 patients

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Seohan computerized 85-hue test

• Mean TES 147 (SD 72.0)
• Type
• Protanomaly 22 eyes
• Deuteranomay 34 eyes

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• When color compensation program was applied,
• TES of Seohan computerized hue test significantly
  reduced.
• Mean 56.7(SD 46.6) (p.000, paired t-test)
• milder color vision defect TES reduced at lower
  color compensation,
• more severe color vision defect TES reduced at
  higher color compensation.
• TES lt 100 42 eyes(60)
• Displacement of central axis
• lt5 52 eyes
• 5 4 eyes
• Reduction of central axis height(error score)
• lt 5 6 eyes
• 5 50 eyes

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Linear Regression of TES of Seohan Test with
Minimal TES of Color Compensated Seohan Test
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Conclusion

• Color compensation program for CVD was effective
  to reduce TES of Seohan computerized hue test and
  improve the recognition of colors.
• It suggests that furthermore it can be helpful to
  actual life in CVD.