Medically reviewed by Johnstone M. Kim, MD Key Takeaways Gray and green eye colors are the rarest in the U.S., although extremely rare red color can occur with albinism.Eye color is determined by the ...

Among the forms of monogenic macular degeneration, the most common is Stargardt disease. This disease is caused by mutations in the ATP-binding cassette transporter alpha 4 subunit (ABCA4) gene, ...

Genetic disorders can occur due to mutations in one gene (monogenic), multiple genes (multifactorial inheritance), and mutation in one or more chromosomes. Point mutations are where one nucleotide in ...