pupil appearance

A pupil is a small round hole in the center of the iris in an animal or human eye, a passage for light to enter the eye. The expansion and contraction of the smooth muscle on the iris can reduce or enlarge the diameter of the pupil and control the amount of light entering the pupil. The subject is seated in the backlight, and both eyes are looking at the largest visual target on the far vision meter. The examiner covers the left eye of the subject and directly illuminates the right eye with a flashlight to observe the speed and size of the pupil change. Then cover the right eye and observe the left eye. Basic Information Specialist Category: Ophthalmic Examination Category: Physical Examination Applicable gender: whether men and women apply fasting: not fasting Tips: When checking, the light should not be too strong. Normal value Adult pupils are generally 2-4mm in diameter, rounded on both sides, and the sides are equal. The difference between the two sides is not more than 0.25mm. However, if the pupil diameters of the eyes are 0.25-0.5mm, there is no abnormality in the pupillary reaction and drug experiment. It can be considered as physiological. Sexual pupils are not equal. Clinical significance Abnormal results: The hole is white in cataract, iridocyclitis, glaucoma, ocular trauma, high myopia, or systemic diseases such as diabetes. The pupil is blue-green and common in glaucoma. Patients with a significant discoloration of the pupil color, white or cyan, need to be examined. Precautions Taboo before the test: avoid emotional excitement. Requirements for inspection: The light should not be too strong. Inspection process The subject is seated in the backlight, and both eyes are looking at the largest visual target on the far vision meter. The examiner covers the left eye of the subject and directly illuminates the right eye with a flashlight to observe the speed and size of the pupil change. Then cover the right eye and observe the left eye. Not suitable for the crowd Inappropriate crowd: no special instructions.