**Question:** Corneal dystrophies are usually:

A. Autosomal dominant
B. Autosomal recessive
C. X-linked
D. Mitochondrial

**Core Concept:** Corneal dystrophies are a group of genetic disorders characterized by the accumulation of abnormal substances in the cornea, leading to its cloudiness and impaired vision. They can be inherited in various patterns, including dominant, recessive, and linked to specific chromosomes.

**Why the Correct Answer is Right:** Corneal dystrophies are typically inherited in a pattern, and the correct answer represents the most common mode of inheritance for this group of disorders. In this case, corneal dystrophies are most commonly inherited in an **Autosomal recessive** manner, which means that an affected individual needs to inherit a mutated gene from both parents to develop the disease.

**Why Each Wrong Option is Incorrect:**

A. **Autosomal dominant:** While some corneal dystrophies can be inherited in an autosomal dominant pattern, the majority fall under the autosomal recessive category, making it incorrect for the majority of corneal dystrophies.

B. **X-linked:** Some corneal dystrophies do involve the X-linked inheritance pattern, but the majority are not, making it an incorrect choice for the majority of corneal dystrophies.

C. **X-linked:** Similar to option B, some corneal dystrophies are linked to the X chromosome, but the majority are not, making it an incorrect choice for the majority of corneal dystrophies.

D. **Mitochondrial:** Corneal dystrophies are primarily genetic disorders involving the cornea, not mitochondrial diseases, which are caused by defects in the mitochondria.

**Clinical Pearl:** Corneal dystrophies are a group of over 30 genetic disorders that affect the cornea, potentially leading to vision impairment or blindness if left untreated. Early diagnosis and intervention are crucial for preserving vision.

**Correct Answer:** Autosomal recessive (Corneal dystrophies can be inherited in this pattern, but are not limited to it, as they can also be inherited via autosomal dominant, X-linked, or mitochondrial inheritance patterns.)