Visual testing method and apparatus

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type

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351224, A61B 302

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active

050509837

ABSTRACT:
Method and apparatus for visual testing. In one embodiment, for perimetry testing, the method uses threshold light-stimulus values determined at multiple seed locations in a visual field to calculate expected stimulus threshold values at locations which are nearest-neighbors of the seed locations. The expected values at the nearest-neighbor locations are compared with subject responses at these locations, and the correspondence between the two is used to refine and guide line stimulus level presentations at the nearest-neighbor locations. The test is continued until a selected confidence level of response at nearest-neighbor locations is reached.

REFERENCES:
Heijl, A. "Computer Test Logics for Automated Perimetry," Acta Ophthalmoligica, 55:837, 3/1977.
Johnson, C. A. "The Test Logic of Automated Perimetry", Acta: XXIV International Congress of Opthalmology, Henkind (ed.), J. B. Lipincott, Philadelphia, 1983.
Johnson, C. A., Keltner, J. L., "Incidence of Visual Field Loss in 20,000 Eyes and its Relationship to Driving Performance," Arch. Opthalmol, vol. 101, pp. 371-375, Mar. 1983b.
Johnson, C. A., Adamsm C. W., & Lewis, R. A., "Fatigue Effects in Automated Perimetry," Applied Optics, vol. 27, pp. 1030-1037, Mar. 1988.
Keltner, J. L., Johnson, C. A., "Comparative Material on Automated and Semi-Automated Perimeters," Opthalmology, vol. 93, pp. 1-25, 1986.
Lewis, R. A. et al., "Preliminary Clinical Trials with the Humphrey Field Analyzer," Doc. Opthalmol. Proc. Ser., vol. 42, pp. 159-165, 1985.
Shapiro, L. R., Johnson. C. A., & Kennedy, R. L., "KRACKEN: A Computer Simulation Procedure for Static, Kinetic, Suprathreshold Static and Heuristic Perimetry," In A. Heijl (ed.), Perimetry Update 1988/89: Proceedings of the VIIIth International Perimetry Society Meeting. Asterdam: Kuglar & Ghedini, pp. 431-438, 1989.
Tyrrell, R. A., & Owens, D. A., "A Rapid Technique to Assess the Resting States of the Eyes and Other Threshold Phenomena: The Modified Binary Search (MOBS)," Behavior Research Methods, Instruments & Computers, vol. 20, pp. 137-141, 1988.

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