What is the average corneal diameter or horizontal visible iris diameter (HVID)?

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Multiple Choice

What is the average corneal diameter or horizontal visible iris diameter (HVID)?

Explanation:
The average horizontal corneal diameter, known as the horizontal visible iris diameter, is about 11.8 millimeters in a typical adult. This measurement represents the width of the cornea seen across the eye and is a standard reference clinicians use when estimating lens size and fit for contact lenses. While individual eyes vary, 11.8 mm is the widely cited average, which is why this value is chosen as the best answer.

The average horizontal corneal diameter, known as the horizontal visible iris diameter, is about 11.8 millimeters in a typical adult. This measurement represents the width of the cornea seen across the eye and is a standard reference clinicians use when estimating lens size and fit for contact lenses. While individual eyes vary, 11.8 mm is the widely cited average, which is why this value is chosen as the best answer.

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