Ophthalmologic apparatus and visual target presenting device
AssigneeTopcon Corporation
InventorsAkira Mizuno, Naoki Inuzuka
Life of this patent
Estimating the term…
Abstract
An ophthalmologic apparatus includes a first visual target presenting unit that presents a first eye chart including a visual target, at a first examination distance, to an examinee's eye of which a trial lens is disposed ahead, and a second visual target presenting unit that presents a second eye chart including a visual target, at a second examination distance different from the first examination distance, wherein the first eye chart and the second eye chart are presented adjacently in plan view in a presentation region in which no influence of aberration of the trial lens is present, within a range viewable by the examinee's eye through the trial lens.
Claims10
An ophthalmologic apparatus comprising:
- a trial lens to test and correct a visual function of an eye of an examinee;
- and
- two visual target presenting units including:
- a first visual target presenting unit configured to present a first eye chart including a first visual target to the eye of the examinee such that the trial lens is disposed between the eye of the examinee and the first visual target, the first visual target being located at a first examination distance from the eye of the examinee;
- and
- a second visual target presenting unit configured to present a second eye chart including a second visual target, to the eye of the examinee such that the trial lens is disposed between the eye of the examinee and the second visual target, the second visual target being located at a second examination distance from the eye of the examinee, and the second examination distance being different from the first examination distance,
- wherein the first visual target presenting unit and the second visual target presenting unit are located at different depth positions such that the second visual target presenting unit is located closer to the eye of the examinee than is the first visual target presenting unit, and
- wherein first visual target presenting unit and the second visual target presenting unit are configured to present the first eye chart and the second eye chart simultaneously and adjacently within the same presentation region so as to be viewable by the eye of the examinee through the trial lens without adjustment of the ophthalmologic apparatus.
A visual target presenting device for use in a subjective ophthalmologic apparatus, the visual target presenting device comprising:
- a first visual target presenting unit configured to present a first eye chart at a predetermined examination distance to an eye an examinee such that a trial lens is disposed between the eye of the examinee and the first eye chart, and
- a second visual target presenting unit configured to:
- present a second eye chart at a second examination distance different from a first examination distance of first eye chart of the first visual target presenting unit of the ophthalmologic apparatus, and
- simultaneously present the second eye chart adjacently to the first eye chart in a presentation region so as to be viewable by the eye of the examinee through the trial lens without adjustment of the visual target presenting device,
- wherein the first visual target presenting unit and the second visual target presenting unit are located at different depth positions such that the second visual target presenting unit is located closer to the eye of the examinee than is the first visual target presenting unit.
Dependencies are inferred from the claim text.