pupillary reflex

The response of the pupil size as a function of light intensity is a neuroreflex, called pupil-to-light reflection. When observing, use the flashlight concentrated in the concentrated light, align the middle of the two eyes, observe the reflection of the light, and then move the light source to the center of the bilateral pupils respectively, observe the direct reflection of the pupil and indirectly reflect the light, and the pupil is caused by the light. The smaller the aperture, called direct reflection of light. If the other eye is illuminated, the pupil of the non-illuminating eye causes a reduction, which is called indirect reflection of light. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: When checking: Do not check the light too strongly. Normal value The normal pupil has an average diameter of 2.5-4 mm under natural light, and the sides are equal, round, and the edges are neat, which can be reduced under bright light, and can be slightly increased in a dark environment. Clinical significance Abnormal results: When the pupil does not respond to light, it is called the reaction to light disappears. Need to check the crowd pupils for light reflection disappears. Precautions Taboo before the test: eat spicy food, emotional. Requirements for inspection: Check the light is not too strong. Inspection process When observing, use the flashlight concentrated in the concentrated light, align the middle of the two eyes, observe the reflection of the light, and then move the light source to the center of the bilateral pupils respectively, observe the direct reflection of the pupil and indirectly reflect the light, and the pupil is caused by the light. The smaller the aperture, called direct reflection of light. If the other eye is illuminated, the pupil of the non-illuminating eye causes a reduction, which is called indirect reflection of light. Not suitable for the crowd Inappropriate crowd: no special instructions.