| 摘要 |
PROBLEM TO BE SOLVED: To measure a subjective refraction correctly in a short time by a target mechanism of a simple constitution. SOLUTION: A target irradiation light source 23R is lighted, a distant view target is set to a subject eye ER, and an irradiating light source for the other eye EL is lighted. An objective refraction measuring mechanism 7 is laterally moved, a pupillary distance is operated, and for a target mechanism 6R for the right eye, after adjustment of an interval of a target mechanism for the left eye, a measuring part 2 is positioned to the subject eye ER to measure objective refraction. Next, a uni-dimensional target of the target mechanism 6R for a subjective refraction is indicated to the subject eye ER, a target of the target mechanism for the left eye is indicated to the other eye EL, and a target means 14R is set in a position of a spherical degree to measure the objective refraction. A line pattern direction of a unidimensional target is set perpendicularly to a weak main diameter line, instructions are given to a subject to respond to the number where the line pattern is visible, the target means 14R is moved little by little to get farther till the line pattern becomes invisible, and a diopter of the target is taken as a subjective spherical degree because a resolution of the subject eye ER to the unidimensional line, pattern is decided by eye refraction force in the vertical meridian direction perpendicular to it.
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