Ophthalmologic apparatus

Abstract

Provided is an optometer solving confusion of a subject by improving the discrimination of an indicator and an indicator presenting state and shortening the optometry time and improving the reliability of the optometry.This optometer 1 includes an indicator plate 43 displaying the indicator S, an indicator projecting optical system 14 projecting the indicator S on an examined eye E, a variable cross cylinder 49 generating a pair of indicator presenting states of the indicator S used for a cross cylinder test, a lamp 55 and a liquid crystal screen 56 generating identifiers 56a1 and 56b1 as identification information, and a dichroic mirror 44 for synthesizing the identifiers 56a1 and 56b1 into the pair of indicator presenting states respectively and presenting them to the examined eye E.

Description

technical field [0001] The present invention relates to an eye testing device capable of measuring at least the optical power of an eye to be tested in a perceptual manner. Background technique [0002] In the measurement of the optical power (eye optical power) of the subject's eye, eye detection based on the self-perceived method measured based on the response of the subject to Landrutto's ring and other visual targets has been used at the same time. Eye detection of the way others perceive (the way others can feel or see) in response to the tester's response. Currently, eye testing devices that can effectively utilize both the self-sensing and other-sensing methods of eye testing are widespread, and efficiency and reliability of inspections have been improved, and space-saving devices have been sought. [0003] In addition, in order to improve the efficiency of inspections, we have developed an eye inspection device in which the subject can perform eye inspections by him...

AI Technical Summary

Problems solved by technology

For example, when a plurality of optotypes are presented to the detected eyes or the state of the optotype presentation (the state of the optotype images projected onto the detected eyes), the visual recognition of multiple optotypes is compared and judged subjectively by the subject to be tested. In the inspection of the test, it is difficult for the examinee to identify which of the multiple optotypes is being prompted

As an example, in the general method of astigmatism examination, that is, the cross cylinder test (hereinafter referred to as CC test), according to the comparison and judgment of the subject, it can be clearly seen that a pair of positive and negative optical powers of the cross cylinder is reversed. Which one of the visual mark prompts the state is checked, but at this time, it often happens that the person being tested cannot tell which is which visual mark prompts the state, which not only causes the long-term eye detection, but also becomes a damage to the eye detection a cause of reliability

[0005] In addition, even in the CC test when the inspector or assistant is present, it is also difficult for the inspected to successfully select the state of the visual mark prompt

Images