- astigmatism [DOID:11782]
A refractive error characterized by the optics of the eye to focus a point object into a sharp focused image on the retina, has_symptom blurred vision.
- age related macular degeneration [DOID:10871]
A degeneration of macula and posterior pole that is characterized by a loss of vision in the center of the visual field (the macula) resulting from damage to the retina and resulting in blurring of the sharp central vision.
- sickle cell disease [DOID:0081445]
A blood protein disease that is characterized by chronic hemolytic anemia and intermittent vaso-occlusive events that result in tissue ischemia leading to acute and chronic pain as well as organ damage that can affect any organ system, resulting from the replacement of one of the beta-globin subunits in hemoglobin with atypical hemoglobin molecules called hemoglobin S which can distort red blood cells into a sickle or crescent shape. Sickle cell disease subtypes should include a detailed genotypic description for the hemoglobin molecules (e.g., Hb S/S, Hb S/C, Hb S/0-thalassemia).
- Moebius syndrome [DOID:13501]
A facial nerve disease characterized by congenital, uni- or bilateral, non-progressive facial weakness and limited abduction of the eye(s).
- refractive amblyopia [DOID:10377]
An amblyopia that is characterized by refractive error in one or both eyes that is not corrected early in childhood resulting in poor development of the visual function in the affected eye(s).