In hirschberg corneal reflex test, corneal light reflex falls in the centre of in between the border of pupil and limbus, the angle of squint is
**Core Concept**
The Hirschberg corneal reflex test is a screening tool used to assess **strabismus**, which is a misalignment of the eyes. This test evaluates the position of the **corneal light reflex** to estimate the angle of deviation. The **corneal light reflex** is the reflection of light off the cornea.
**Why the Correct Answer is Right**
When the corneal light reflex falls in the centre of the cornea or between the border of the pupil and limbus, it indicates a specific angle of squint. The Hirschberg test estimates that for every millimeter of deviation from the centre of the pupil, there is approximately a 15-20 degree angle of squint. Given the reflex is near the border of the pupil and limbus, this suggests a moderate angle of deviation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option would correspond to a more severe angle of squint, which is not indicated by the reflex's position near the pupil-limbus border.
**Option B:** This option might suggest a smaller angle, not aligning with the reflex's position.
**Option D:** This option would typically indicate a larger or different type of deviation not consistent with the described reflex position.
**Clinical Pearl / High-Yield Fact**
The Hirschberg test is a quick and useful method for estimating the angle of strabismus, particularly in children or non-cooperative patients. Remembering the 15-20 degree per millimeter correlation can help in rapid assessments.
**Correct Answer:** Correct Answer: B. 30 degrees.