Cone-rod dystrophy (CRD) is an inherited progressive disease characterized by the loss of the cone and rod photoreceptor cells, responsible for both central and color vision. The prevalence of CRD is estimated at 1 in 40,000.
The symptoms of CRD include decreased visual acuity followed by loss of peripheral vision, loss of color vision, sensitivity to bright lights and decreased sensitivity in the central visual field.
The pattern of inheritance might be autosomal dominant, autosomal recessive and X-linked inheritance.
Indications for genetic testing:
1. Confirmation of clinical diagnosis
2. Determination of sporadic cases
3. Carrier testing for at-risk family members
4. Genetic counseling