It is a much rarer condition than keratoconus, which is the most common dystrophy of the cornea. Similar to keratoconus it is typically diagnosed in the patient's adolescent years and attains its most severe state in the twenties and thirties.
Keratoglobus
Arbor vitae 
Phadebas
Hemosiderinuria
Pentosuria
Parosmia
Harderoporphyria
Scurvy