Understanding Keratometry: A Diagnostic Test for Eye Conditions
Keratometry is a diagnostic test used to measure the curvature of the cornea, which is the clear dome-shaped surface at the front of the eye. It helps eye care professionals diagnose and manage various eye conditions, such as astigmatism, nearsightedness, and farsightedness.
There are two types of keratometry:
1. Corneal topography: This test uses a computer-assisted imaging system to create a map of the cornea's surface. It measures the curvature of the cornea in multiple points and creates a detailed map of the eye's surface.
2. Keratometer: This is an instrument that uses a beam of light to measure the curvature of the cornea. It is typically used in conjunction with a slit lamp, which is a specialized microscope used to examine the eye.
During a keratometry test, the eye care professional will place a keratometer or corneal topography instrument in front of the eye and measure the reflection of light off the cornea. The instrument will then calculate the curvature of the cornea based on the angle of the reflected light.
The results of a keratometry test can help eye care professionals diagnose and manage various eye conditions, such as:
* Astigmatism: This is a common condition where the cornea is irregularly shaped, causing blurred vision at all distances. Keratometry can help measure the degree of astigmatism and determine the best course of treatment.
* Nearsightedness (myopia): This is a condition where close objects are seen clearly, but distant objects appear blurry. Keratometry can help measure the degree of nearsightedness and determine the best course of treatment.
* Farsightedness (hyperopia): This is a condition where distant objects are seen clearly, but close objects appear blurry. Keratometry can help measure the degree of farsightedness and determine the best course of treatment.
Overall, keratometry is an important diagnostic tool used to measure the curvature of the cornea and diagnose various eye conditions. It helps eye care professionals determine the best course of treatment for their patients and improve their vision.
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