Method for changing visual function of subject, method for measuring necessity of spherical refractive correction of subject, and optical system for carrying out the method

摘要

The present invention relates to a method for changing the visual function of a subject using an optical system disposed in front of at least one of the subjectsB) specifying the vision table andC) the visual acuity table is displayed on the examinee in such a way that it is visually recognized by the examinee through the optical systemEvaluation of visual function of the examinee by observing the visual table through the optical systemE) adding positive or negative variation values of the spherical refracting to the optical system.In accordance with the present invention, the method of selecting the target value of the visual function prior to step B and at step B, the sight table has a magnitude specified according to the target value of the visual function, and at step e) the change in the spherical refractive power is Including being identified according to the target value of the visual function.