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US 6,293,675 B1Granted
Macular stressmeter
AssigneeElmer H. Eger
InventorElmer H. Eger
Life of this patent
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Abstract
A portable, integrated, hand-held visual examination apparatus for conducting a photostress test on the retina of the human eye. The apparatus includes, within the housing, a timing mechanism, a flash mechanism and an input device, for activating these mechanisms.
Claims20
A visual examination apparatus for bleaching the human retina and measuring the recovery time of the retina, comprising:
- a portable housing adapted to be manually positioned in an operating position by the operator;
- a flash mechanism positioned within the portable housing, the flash mechanism adapted to emit a flash of light from the apparatus;
- a timing mechanism positioned within the portable housing, the timing mechanism adapted to calculate and record elapsed time;
- and
- an input device positioned within the portable housing having at least one input, the input device, when actuated, communicates with the flash mechanism and the timing mechanism, wherein a first input simultaneously triggers the flash mechanism and starts the timing mechanism, and a second input stops the timing mechanism.
2 more elements
A visual examination apparatus for bleaching the human retina and measuring the recovery time of the retina, comprising:
- a hand-held housing adapted to be easily held by a user during operation of the apparatus;
- a flash mechanism positioned within the hand-held housing, the flash mechanism adapted to emit a flash of light from the apparatus;
- a timing mechanism positioned within the hand-held housing, the timing mechanism adapted to calculate and record elapsed time;
- and
- an input device positioned within the hand-held housing having at least one input, the input device, when actuated, communicates with the flash mechanism and the timing mechanism,
- wherein a first input simultaneously triggers the flash mechanism and starts the timing mechanism, and a second input stops the timing mechanism.
3 more elements
A method of testing the recovery time for a retina, comprising the steps of:
- providing an apparatus including a portable housing, a flash mechanism positioned within the portable housing, a timing mechanism positioned within the portable housing, and an optotype chart having at least one line of optotypes thereon;
- occluding one eye of a patient;
- positioning the apparatus at a typical reading distance from a patient;
- reading, by the patient, of a line of optotypes on the optotype chart;
- positioning the apparatus to a closer position in front of the non-occluded eye of the patient;
- actuating the apparatus to simultaneously trigger the flash mechanism and start the timing mechanism;
- positioning the apparatus at a typical reading distance from the patient;
- reading, by the patient, of a second line of optotypes on the optotype chart;
- actuating the apparatus to stop the timing mechanism;
- and
- recording the recovery time.
8 more elements
Dependencies are inferred from the claim text.