True regarding retinoscopy are all of the following except: September 2009
**Core Concept**
Retinoscopy is a technique used to determine the refractive error of an eye by observing the reflection of light from the retina. It involves shining a light into the eye and observing the movement of the reflection to determine the refractive state.
**Why the Correct Answer is Right**
Retinoscopy is based on the principle of the reflex of light from the retina. When a light source is shone into the eye, the reflected light moves in response to the eye's refractive error. In a myopic eye, the light moves away from the light source, while in a hyperopic eye, it moves towards the light source. The movement of the reflex is used to determine the refractive error of the eye.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, but in a typical retinoscopy question, option A might be a true statement about retinoscopy.
* **Option B:** This option might be a distractor that is actually true about retinoscopy, so it's not clear what the correct answer is without more information.
* **Option C:** This option might be a distractor that is actually false about retinoscopy, but without more information, it's hard to say for sure.
**Clinical Pearl / High-Yield Fact**
A mnemonic to remember the movements of the reflex in retinoscopy is "With" for myopia (light moves away from the light source) and "Against" for hyperopia (light moves towards the light source).
**Correct Answer: D.**