Keratometer

Key Features

• Corneal curvature measurement: The keratometer measures the reflection of light from the cornea to calculate its curvature. This is critical for identifying abnormalities such as astigmatism, where the cornea has an uneven shape.
• Measurement units: The curvature is typically measured in diopters, which is the unit used to express the refractive power of the cornea.
• Two principal meridians: The device measures the curvature along the eye's two principal meridians—usually the flattest and steepest parts of the cornea—helping to quantify the extent of astigmatism.
• Reflection of light: The instrument projects a circle of light onto the cornea, and the examiner observes the reflected image. By adjusting the device, they can determine the radius of curvature based on the size of the reflection.