corneal photometry

The corneal mapping method (Hirschbeng method) is a rough method for examining dominant co-rotating strabismus, which is more suitable for children and amblyopia, or patients who cannot be examined in detail. Dispose of a light 33cm in front of the subject, and watch it. For example, if the corneal light reflection point is located at the positive center of the pupil of both eyes, it is a positive eye. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Before taboo check: the light source should not be strong. Normal value The gaze point of the gaze is at the center of the pupil, and the illuminating point on the cornea of ​​the slanted eye is located at a non-central point. The corneal reflection point is 1 mm away from the center of the pupil, which is equivalent to the visual axis deflection of 7o (15△). If the cornea reflection point is located at the edge of the pupil, the visual axis is about 2mm, which is equivalent to 15o (30△); the corneal reflection point is located between the pupil edge and the limbus, about 4mm, which is equivalent to 30o (60△); The light spot is located at the limbus equivalent to 45o (90~100△). Clinical significance Abnormal results The patient's one eye or two eyes are not well watched, and the eye mark in front of the eye cannot be stably steadily observed, or the eye movement function is poor, or there are serious limiting factors that make the eyeball unable to move, or the patient is young. If the attention is too poor to cooperate, the above conditions are suitable for corneal reflection to check the eye position. Patients who need to check for changes in the eye position of the population. Precautions Taboo before inspection: the light source should not be strong. Inspection requirements: The patient is sitting in front of the light. Inspection process Dispose of a light 33cm in front of the subject, and watch it. If the cornea light reflection point is located at the positive center of the pupil of both eyes, it is a right eye; if the cornea light reflection occurs in the center of one pupil, and the other eye is at the pupil edge, the deflection is about 10 to 15 degrees; on the limbus, The deviation is about 45 degrees; at the midpoint between the center of the cornea and the limbus, the squint is about 25 degrees. Not suitable for the crowd Inappropriate crowd: Keep your eyes on, and keep watching.