corneal examination

The corneal examination method includes photogrammetry, staining, and perceptual examination. It can also be used with Cochet and Bonnet's corneal sensory meter. It can accurately detect eye diseases by using various examination methods, and also has a healthy eye. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Before the inspection, taboos: Unexplained, indiscriminate medical advice. Normal value The average size of the male and female corneas in China is about 11 mm in transverse diameter and about 10 mm in vertical diameter. Generally, the width of the upper limbus should be measured at the same time. The upper limbus of our country is about 1 mm wide. Because the upper limbus of our country is wide, we usually determine the size of the cornea by its transverse diameter. If the transverse diameter is greater than 12 mm, it is a large cornea, and when it is less than 10 mm, it is a small cornea. Clinical significance Abnormal results can be observed under diffuse natural light. If it is suspected to be conical, the patient can look down. At this point, the apex of the cornea can slightly lift the central part of the lower jaw. It can be proved to be a keratoconus. At the same time, attention should be paid to whether it is a spherical cornea, a flat cornea, a corneal ectasia or a corneal staphyloma. Need to check the eyes of people with inflammation in the eyes. Precautions Taboo before the examination: Unexplained, unintentionally, asking for medicine. Requirements for inspection: The instrument should be clean and the patient should cooperate with the doctor. Inspection process For example, in the perceptual examination, a small piece of sterile cotton can be twisted into a pointed shape, and the tip of the cornea can be touched with its tip; it should be noted that it should be touched from the side of the eye. It is best not to let the patient see the examiner's movement from the front, so as to avoid A defensive blink is produced and the result is confusing. If the perception is normal, when the cornea is touched, the reflex blink movement must occur immediately. If the reflex is slow, it means that there is a decrease in perception. If the perception disappears completely, there is no performance after the touch. Both eyes should be tested the same for comparison and judgment. Not suitable for the crowd Inappropriate people: In fact, people who have no obvious problems in their eyes do not need to check.