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Normative data for the standard pseudoisochromatic plates--Part 2
J K Hovis1, C L Cawker, D Cranton
1School of Optometry, University of Waterloo, Ontario.
Journal of the American Optometric Association
|December 1, 1990
Summary
Establishing norms for the Standard Pseudoisochromatic Plates--Part 2 is crucial for diagnosing acquired color vision deficiencies. Age-specific error counts help identify blue-yellow and red-green defects accurately.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Acquired color vision deficiencies require accurate screening.
- Age-related changes in color vision necessitate age-specific diagnostic norms.
- The Standard Pseudoisochromatic Plates--Part 2 (SPPI-2) is a screening tool for acquired color vision defects.
Purpose of the Study:
- To establish age-specific norms for the SPPI-2 test.
- To refine diagnostic criteria for blue-yellow and red-green color vision defects based on age.
Main Methods:
- The study analyzed responses from participants across different age groups using the SPPI-2.
- Error counts for blue-yellow and red-green test figures were correlated with age.
- Normative data were developed based on age-stratified error thresholds.
Main Results:
- For blue-yellow defects, one or more errors indicate a defect in individuals aged 20-60, while two or more errors are needed for those under 20 or over 60.
- For red-green defects, one or more errors suggest a defect in individuals under 60, and two or more errors are indicative for those over 60.
- Subjective judgments of figure distinctness did not improve diagnostic comparisons.
Conclusions:
- Age-specific interpretation of SPPI-2 results is essential for accurate diagnosis of acquired color vision deficiencies.
- The established error thresholds provide reliable criteria for identifying blue-yellow and red-green defects across different age groups.
- The SPPI-2, with these age-adjusted norms, serves as an effective screening tool for acquired color vision defects.