Patient complains of distoed vision after wearing spectacles, which worsens in both meridians progressively. Which of the following is not true about this condition?
**Distorted Vision and Progressive Worsening**
**Core Concept**
The patient's symptoms suggest anisometropic amblyopia or astigmatism, where the refractive error in one or both meridians causes progressive worsening of vision. This condition is often due to anisometropia, where the difference in refractive power between the two eyes leads to unequal vision in both eyes.
**Why the Correct Answer is Right**
Anisometropic amblyopia is a condition where the brain favors the eye with the better vision, leading to suppression of vision in the weaker eye. This suppression is often due to the difference in refractive power between the two eyes, causing the weaker eye to have a higher degree of anisometropia. The correct answer is the statement that does not accurately describe this condition.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because anisometropic amblyopia can indeed cause progressive worsening of vision in both meridians. The difference in refractive power between the two eyes can cause unequal vision, leading to suppression and worsening of vision in the weaker eye.
**Option B:** Incorrect because astigmatism is a common cause of distorted vision and can be a contributing factor to anisometropic amblyopia. Astigmatism is a refractive error that causes blurred vision at all distances and can be treated with spectacles or contact lenses.
**Option C:** Incorrect because anisometropia is a common cause of anisometropic amblyopia. Anisometropia is a condition where the difference in refractive power between the two eyes is greater than 1.5 diopters, leading to unequal vision and suppression of the weaker eye.
**Option D:** (Correct answer) Incorrect because anisometropic amblyopia is not typically caused by a sudden change in refractive error, but rather by a gradual difference in refractive power between the two eyes.
**Clinical Pearl / High-Yield Fact**
Remember that anisometropic amblyopia can be treated with corrective lenses, patching therapy, or vision therapy to improve vision in the weaker eye. Early detection and treatment are crucial to prevent permanent vision loss.
**Correct Answer:** D.