Corneal Pachymetry

Measurement of corneal thickness contributes to the diagnosis and prognosis of certain corneal lesions, as well as surgical design before corneal refractive surgery and corneal transplantation. Ultrasound measurement is a simple and accurate method for measuring corneal thickness. The ultrasonic corneal thickness measuring instrument uses a 20~30MHz probe with a measurement accuracy of ±0.001mm. The corneal central thickness and corneal peripheral thickness parameters are generally measured under corneal surface anesthesia. The measurement was repeated 3 times and averaged. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Inappropriate people: no corneal edema. Taboo before inspection: Do not touch with your hands, it is easy to break. Normal value A normal person has a corneal thickness of between about 500 and 600 um. Clinical significance Abnormal results Generally, the cornea of ​​the myopic eye and the elderly is thinner, and it is easy to rupture when suffering from trauma; the corneal thickness of children under 3 years old is thicker than that of adults; the corneal edema is thickened. Need to check the crowd myopia and the elderly. Precautions Taboo before inspection: Do not touch with your hands, it is easy to break. Requirements for inspection: The instrument is clean and the doctor operates as required. Inspection process The ultrasonic corneal thickness measuring instrument uses a 20~30MHz probe with a measurement accuracy of ±0.001mm. The corneal central thickness and corneal peripheral thickness parameters are generally measured under corneal surface anesthesia. The measurement was repeated 3 times and averaged. The thickness of the cornea is measured at 12, 3, 6, and 9 points in the limbus at l~2 mm. Calculate the thickness of each surrounding area or take the average thickness of 4 points as needed. Ultrasonic measurement of the central corneal thickness of 0.6mm, the surrounding thickness of 0.8mm. In the past, the corpse measures the central thickness of the cornea 0.8mm, and the peripheral thickness is 1.0mm. It is considered that the thicker cadaver is caused by the thickening of corneal edema after death. Not suitable for the crowd Inappropriate crowd: no corneal edema.

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