Refractive examination

Refractive examination is to understand the degree of refraction of the eyeball to determine the degree of eyeglasses required. Retinoscopy must be performed in a series of tests called refractive examination. First use the two methods to test the ball lens. When the vision is no longer increased, let the examinee pass the sulcus sheet to check the presence or absence of astigmatism. When the slit is rotated, the visual acuity is not affected and it is proved that there is no astigmatism. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Before the examination, the taboos are indiscriminate. Normal value 1.25 diopter hyperopic astigmatism, the axis of the cylinder is in the 90° direction. 2.00 diopter myopia, combined with 1.25 diopter myopia astigmatism, the axial position of the cylinder is in the 135° direction. Clinical significance Abnormal results When a slit is transferred to a warp, the extraordinarily clear is the basis for the presence of astigmatism. Need to check patients with refractive errors. Precautions Forbidden before the examination: Indiscriminate medical advice. Requirements for inspection: A series of inspections are carried out according to the doctor's request. Inspection process Slit film method: first use the two methods to test the ball lens. When the eyesight is no longer increased, let the examinee pass the sulcus sheet to check the presence or absence of astigmatism. When the slit is rotated, the visual acuity is not affected and it is proved that there is no astigmatism. However, when the slit piece is turned to a warp, the extraordinarily clear is the evidence of the existence of astigmatism. At this time, the crack is turned to the vertical position of the warp, and the ball mirror is used to test, so that the vision reaches the maximum height, according to the direction of the crack and the additional With the spherical mirror, the axial position and degree of astigmatism can be obtained. Not suitable for the crowd Inappropriate people: people with visual impairment.