Purpose: The design of an automatic instrument for the estimation of subjective dark adaptation (minimum perceptible for light) by an uninterrupted chain of trials.
Methods: A light emitting diode is used as test light. The patient answers by pressing a button when light is perceived. The process is controlled by means of a lap top computer and traces the adaptation course step by step.
Results: The instrument was tested by recording the course of dark adaptation (DA) in a clinical series of normals and of patients. The threshold sensitivity (after 25 min in darkness) showed very satisfying reproducibility.
Conclusion: The instrument described was found to be reliable and well suited for clinical routine as well as experimental work.
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| http://dx.doi.org/10.1034/j.1600-0420.1998.760128.x | DOI Listing |
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