Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1978-08-15
1982-06-15
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
351 23, A61B 302, A61B 300
Patent
active
043347380
ABSTRACT:
A method of static perimetric examination of the visual field of a subject involves presenting to the subject a plurality of spots of light of predetermined stimulus values which constitute a group of statistically ascertained mean thresholds for the age group of the subject. Such light spots are presented in a test field in accordance with a randomly selected pattern which is determined by a computer. The computer records the threshold value of each spot and modifies the corresponding stimulus value of the group by replacing it with the threshold value. The modified group is used for presentation of light spots to the same subject during a future test. The threshold values which are obtained in the course of the next-following test are processed by the computer in such a way that the computer replaces each stimulus value of the modified group with the freshly ascertained threshold value if the stimulus value of the modified group does not constitute a perimetrically ascertained threshold value; otherwise, the computer records a value which represents the arithmetic mean between the freshly ascertained threshold value and the corresponding stimulus value of the modified group. The computer further ascertains additional threshold values by interpolation, and the interpolated threshold values replace the corresponding stimulus values of the original group or are replaced with the corresponding stimulus values of the modified group if such stimulus values represent perimetrically ascertained thresholds.
REFERENCES:
patent: 3664732 (1972-05-01), Lynn
patent: 3718386 (1973-02-01), Lynn et al.
patent: 4145123 (1979-03-01), Krahn et al.
Bedwell, American Journal of Optometry and Archives of American Academy of Optometry, 10/67.
Bovernick Rodney B.
Corbin John K.
Interzeag AG
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