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Detection of functional vision loss using the Ishihara plates
1Department of Ophthalmology, Royal Children's Hospital, Brisbane, Queensland, Australia.
Summary
The Ishihara test can detect functional vision loss by revealing normal color vision despite apparent deficits. This method uses specific plates to differentiate true color blindness from malingering.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Science
Background:
- Functional visual loss detection relies on various methods.
- Objective evidence is crucial for diagnosing visual impairments.
Observation:
- Four cases presented with apparent functional vision loss.
- Patients could read the initial Ishihara plate (No. 12).
- They failed to distinguish pseudo-isochromatic numbers on subsequent plates (2-17).
Findings:
- Patients successfully traced winding lines on Ishihara plates (18-24).
- This indicated intact color vision, contradicting initial findings.
- The Ishihara test provided objective evidence of functional vision loss.
Implications:
- The Ishihara test can be a tool to identify non-organic visual loss.
- This highlights the importance of comprehensive visual assessments.
- Understanding functional vision loss aids in accurate diagnosis and treatment planning.