pupil meter

The pupil meter is another tool used in preoperative examinations. This hand-held device is used to accurately measure the diameter of the pupil. Because the pupil's reflection of infrared light is different from the surrounding iris, the sensor of the pupil meter accurately determines the starting point of the pupil and measures its diameter. Normally, the light is measured first, then the light is turned off, so that the doctor can see the change in the size of the patient's pupil. Basic Information Specialist Category: Ophthalmic Examination Category: Physical Examination Applicable gender: whether men and women apply fasting: not fasting Tips: Before taboo check: Do not be stimulated, the pupil will be enlarged. 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 pupil is the passage of the front and rear aqueous water. Once locked, the circulation of the aqueous humor in the eye will be impeded, resulting in an increase in intraocular pressure and formation of secondary glaucoma. Therefore, the opening or contraction of the pupil is of great clinical significance. Need to check patients with drug poisoning, glaucoma. Precautions Taboo before the test: Do not be stimulated, the pupil will be enlarged. Requirements for inspection: The instrument should be clean and cooperate with the doctor. Inspection process Because the pupil's reflection of infrared light is different from the surrounding iris, the sensor of the pupil meter accurately determines the starting point of the pupil and measures its diameter. Normally, the light is measured first, then the light is turned off, so that the doctor can see the change in the size of the patient's pupil. Not suitable for the crowd Inappropriate crowd: no special instructions.