What Is Keratometry?

The average size of corneas in men and women in our country 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 millimeter wide. Because the upper limbus of our people is wider, the size of the cornea is generally determined only by its transverse diameter. If the transverse diameter is greater than 12 mm, it is a large cornea, and if it is less than 10 mm, it is a small cornea.

The corneal examination method includes photogrammetry, staining method, and perceptual examination method. Cochet and Bonnet's corneal sensory meter can also be used. It can accurately detect eye diseases by using various examination methods, and it can also restore a healthy eye.

Name: Corneal examination

category: Ophthalmology

Corneal normal

Clinical significance of corneal examination

Abnormal results: The corneal curvature can still be observed under diffuse natural light. If a cone is suspected, the patient can look down. At this time, the vertex of the cornea can slightly lift the center of the lower eyelid, thus It can be proved that it is keratoconus. At the same time, you should also pay attention to whether it is spherical cornea, flat cornea, corneal bulge or corneal edema. Need to check the crowd: patients with eye inflammation.

Corneal examination precautions

Inappropriate: In fact, people who have no obvious problems with their eyes do not need to be checked. Contraindications before the examination: Unknown facts, ask for medical advice. Inspection requirements: The instrument should be clean and the patient cooperate with the doctor.

Corneal examination

For example, a small piece of sterilized cotton can be rubbed into a pointed shape during the perceptual examination, and the tip of the cornea should be used to touch the corneal surface. It should be touched from the side of the eye. A defensive blink occurred and the correct result was confused. If the perception is normal, a reflective blinking motion must occur immediately after touching the cornea. If the reflection is dull, it means that there is a decrease in consciousness, and if the consciousness completely disappears, there is no performance after touch. Both eyes should be tested the same for easy comparison and judgment.

Corneal examination related diseases

Fungal keratitis, stromal keratitis, secondary glaucoma with iridocyclitis, keratopathy, suppurative keratitis, Thygeson superficial punctate keratopathy, staphylococcal marginal keratitis, Fuchs Corneal endothelial dystrophy, Terrien corneal limbal degeneration, neurogenic keratitis