One millimeter increase in the radius of curvature of cornea leads to hypermetropia of:
**Core Concept**
The underlying principle being tested is the relationship between the radius of curvature of the cornea and refractive power, which affects vision. **Refractive errors** occur when the shape of the cornea or lens alters, leading to improper focusing of light on the retina. This can result in conditions such as **hypermetropia** (farsightedness).
**Why the Correct Answer is Right**
An increase in the radius of curvature of the cornea reduces its refractive power, leading to **hypermetropia**. This is because a larger radius of curvature means a less steep corneal surface, which bends light less. As a result, light is focused behind the retina instead of directly on it, causing close objects to appear blurry.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the change in refractive power due to a 1mm increase in corneal radius would not result in such a high degree of hypermetropia.
**Option B:** Similarly, this option underestimates the degree of hypermetropia that would occur from a 1mm change.
**Option D:** This option overestimates the degree of hypermetropia that would result from the specified change in corneal curvature.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that even small changes in the corneal curvature can significantly impact vision, highlighting the importance of precise measurements in ophthalmology.
**Correct Answer:** Correct Answer: C. 6 Diopters.