corneal topography

The corneal topography is to examine the corneal morphology of each patient through a corneal topographer. The topographical map of the corneal front and back surface can determine the curvature of the patient's cornea, the type of astigmatism, and whether the keratoconus may be found in the cornea. The contact lens wearer should be removed for at least 2 weeks; the hard lens should be worn for more than 4 weeks. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Before the examination: the tear film is incomplete, the tear film is incomplete and the cornea is dry and affects the test results. Requirements for inspection: The lens of the contact lens wearer should be removed for at least 2 weeks; the hard lens should be worn for more than 4 weeks. Normal value (1) The refractive power in the center of the cornea is >46.5D; (2) IS value > 1.26D; (3) The difference in corneal refractive power between the two eyes of the same patient was >0.92D. Clinical significance Abnormal results The central corneal refractive power is large, the lower cornea is steeper than the upper cornea, and the upper cornea is steeper than the lower cornea. The central refractive power of the same individual cornea is large. Need to check the population of keratoconus patients, refractive is not large. Precautions Contraindications before examination: the tear film is incomplete, the tear film is incomplete and the cornea is dry and affects the test results. Requirements for inspection: The lens of the contact lens wearer should be removed for at least 2 weeks; the hard lens should be worn for more than 4 weeks. Inspection process 1. Enter the patient's name, age, gender, diagnosis, etc. into the computer after power on. 2. Explain the procedure to the patient and keep the patient comfortable during the exam. The patient takes the sitting position, the lower jaw is placed on the lower jaw, and the headband is used to fix the head position. 3. The patient is examined with a fixed light from the center of the spectacles. 4. Start the inspection. Not suitable for the crowd Inappropriate people: people with normal corneas.

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