APPARATUS FOR SELF-CONSCIOUSLY MEASURING THE REFRACTIVE POWER OF AN EYE

An apparatus for subjectively measuring the refractive power of an eye includes obliquely disposed beam splitter means, diaphragm means provided on the reflection optical axis of the beam splitter means and having a pair of openings symmetric with the reflection optical axis, collimation mark means provided on the reflection optical axis of the beam splitter means and on the side opposite to the beam splitter means, first imaging lens means provided between the beam splitter means and the diaphragm means, second imaging lens means provided between the diaphragm means and the collimation mark means, rotating means for rotating an image of the openings of the diaphragm means about the reflection optical axis, means for varying the optical distance of the collimation mark means relative to the diaphragm means, first converter means for causing the angle of rotation of the rotating means to correspond to the direction of the astigmatism axis, and second converter means for causing the optical distance between the diaphragm means and the collimation mark means to correspond to the refractive power.