ishihara_screening_result: Ishihara Color Vision Test Screening Interpretation

In cliot: Clinical Indices and Outcomes Tools

Ishihara Color Vision Test Screening Interpretation

Description

Interprets the results of the Ishihara Test for Color Blindness based on the number of plates administered and the number of errors made. The function supports the standard 38-plate, 24-plate, and short screening (14-plate) editions. It screens primarily for congenital red-green color deficiencies (protan and deutan defects).

Usage

ishihara_screening_result(total_plates_administered, error_count)

Arguments

total_plates_administered	Numeric. The total number of plates included in the specific test edition used (typically 14, 24, or 38).
error_count	Numeric. The total number of plates read incorrectly by the patient. (Note: Plate 1 is usually a control and should be read correctly by all; if missed, the test is invalid, but this function counts it as a standard error).

Value

A list containing:

Test_Format	Indicates which edition of the test was likely used.
Screening_Result	"Normal Color Vision", "Color Vision Deficiency Suspected", or "Indeterminate".
Interpretation	Clinical context of the result.
Next_Steps	Recommendations for referral or further testing (e.g., Anomaloscope).

References

Ishihara S. Tests for colour-blindness. Kanehara Shuppan. 1972.

Examples

# Example 1: Normal Result (38-plate edition)
# 2 errors made out of 38
ishihara_screening_result(38, 2)

# Example 2: Deficiency Suspected (14-plate short screening)
# 5 errors made out of 14
ishihara_screening_result(14, 5)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.