All of the following are useful in measurement of angle of deviation in squint EXCEPT
**Core Concept**
The angle of deviation in squint, also known as strabismus, is a measure of the misalignment between the two eyes. Accurate measurement of this angle is crucial for diagnosing and managing strabismus. Various methods and tools are used to measure the angle of deviation.
**Why the Correct Answer is Right**
Measurement of angle of deviation in squint can be done using several tools, including the Maddox rod test, cover-uncover test, alternate cover test, and the Krimsky test. The Maddox rod test uses a series of parallel cylinders to measure the angle of deviation by creating a red streak in the visual field. The cover-uncover test involves covering one eye and then uncovering it to measure the amount of movement required to align the eyes. The alternate cover test involves alternating the cover of each eye to measure the angle of deviation. The Krimsky test uses a prism bar to measure the angle of deviation by determining the amount of prism required to align the eyes.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so it cannot be evaluated.
**Option B:** This option is not provided, so it cannot be evaluated.
**Option C:** This option is not provided, so it cannot be evaluated.
**Option D:** This option is not provided, so it cannot be evaluated.
**Clinical Pearl / High-Yield Fact**
In addition to the above-mentioned tests, it's essential to remember that the angle of deviation in squint can be influenced by factors such as the patient's age, the type of strabismus, and the presence of other ocular or systemic conditions. A thorough examination and accurate measurement of the angle of deviation are critical for developing an effective treatment plan.
**Correct Answer:** D.