Hemeralopia; heliophobia & day blindness caused by:
1. Cone dystrophy- inherited ocular disorder due to the loss of cone cells in the retina.
2. Achromatopsia- Total color blindness.
3. Trimethadione- side effect ( anti-epileptic drug).
4. Adie’s pupil- Tonically dilated pupils due to neurological disorders.
5. Aniridia- Absence of the iris due to congenital or penetrating injury.
6. Albinism- congenital absence of any pigmentation in a person.
7. central cataract.
8. CAR- Cancer Associated Retinopathy.
9. Cohen syndrome- a rare autosomal recessive genetic disorder due to genetic mutation at locus 8q22-23
10. Chorioretinitis- an inflammation of choroid and retina.
11. Atrophy of optic nerves or retina.
12. Coloboma- a hole in the iris, retina, choroid, or optic disk.
13. Uni or bilateral post chiasmatic brain injury.