Cone dystrophy usually manifests itself between the first and third decades of life, progressively and bilaterally reducing central vision and color perception, which is likely later to be combined with photophobia. The functionality of the cones decreases and visual acuity gradually deteriorates, but in some cases it can deteriorate rapidly.
The disease is hereditary and it is possible that a child has cone dystrophy without the parents or other first-degree relatives being ill. This is due to a mutation of the gene responsible for the disease.
Cone dystrophy is not treated with conventional glasses. The daily use of special low-vision glasses is necessary. Special glasses will delay the progression of the disease and noticeably increase vision.