Which of the following is not a feature of the congenital esotropia
**Core Concept**
Congenital esotropia, also known as congenital strabismus, is a form of esotropia that is present at birth or develops in the first few months of life. It is characterized by an inward deviation of one or both eyes, often accompanied by other ocular and systemic anomalies.
**Why the Correct Answer is Right**
Congenital esotropia is typically associated with a high degree of deviation, often greater than 20 prism diopters, and is often accompanied by other ocular features such as a high incidence of amblyopia, nystagmus, and a high risk of developing secondary esotropia in the other eye. The deviation in congenital esotropia is usually constant and is not significantly improved by covering the deviating eye.
**Why Each Wrong Option is Incorrect**
**Option A:** This option may be a feature of congenital esotropia, as nystagmus is often present in infants with this condition.
**Option B:** This option is a common feature of congenital esotropia, as the deviation is typically constant and not significantly improved by covering the deviating eye.
**Option C:** This option may be a feature of congenital esotropia, as amblyopia is a common complication of this condition.
**Clinical Pearl / High-Yield Fact**
It's essential to note that congenital esotropia often requires early treatment to prevent amblyopia and other complications. A high degree of deviation and the presence of nystagmus or other ocular anomalies are red flags for congenital esotropia.
**Correct Answer:** D