diseases classified elsewhere (H36.0) Diabetic retinopathy H40-H42 Glaucoma (H40.1) Primary open-angle glaucoma (H40.2) Primary angle-closure glaucoma (H40.3) Primary Normal tension glaucoma H43-H45 Disorders of vitreous body and globe (H43.9) Floaters — shadow-like shapes which appear singly or together with several others in the field of vision H46-H48 Disorders of optic nerve and visual pathways (H47.2) Leber's hereditary optic neuropathy — genetic disorder; loss of central vision,. (H47.3) Optic disc drusen — globules progressively calcify in the optic disc, compressing the vascularization and optic nerve fibers H49-H52 Disorders of ocular muscles, binocular movement, accommodation and refraction (H49-H50) Strabismus (Crossed eye/Wandering eye/Walleye) — the eyes do not point in the same direction (H49.3-4) Ophthalmoparesis — the partial or total paralysis of the eye muscles (H49.4) Progressive external ophthaloplegia — weakness of the external eye muscles (H50.0, H50.3) Esotropia — the tendency for eyes to become cross-eyed (H50.1, H50.3) Exotropia — the tendency for eyes to look outward H52 Disorders of refraction and accommodation (H52.0) Hypermetropia (Farsightedness) — the inability to focus on near objects (and in extreme cases, any objects) (H52.1) Myopia (Nearsightedness) — distant objects appear blurred (H52.2) Astigmatism — the cornea or the lens of the eye is not perfectly spherical, resulting in different focal points in different planes (H52.3) Anisometropia — the lenses of the two eyes have different focal lengths (H52.4) Presbyopia — a condition that occurs with growing age and results in the inability to focus on close objects (H52.5) Disorders of accommodation Internal ophthalmoplegia H53-H54.9 Visual disturbances and blindness (H53.0) Amblyopia (lazy eye) — poor or blurry vision due to either no transmission or poor transmission of the visual image to the brain (H53.0) Leber's congenital amaurosis — genetic disorder; appears at birth, characterised by sluggish or no pupillary responses (H53.1, H53.4) Scotoma (blind spot) — an area impairment of vision surrounded by a field of relatively well-preserved vision. See also Anopsia. (H53.5) Color blindness — the inability to perceive differences between some or all colors that other people can distinguish (H53.5) Achromatopsia / Maskun — a low cone count or lack of function in cone cells (H53.6) Nyctalopia (Nightblindness) — a condition making it difficult or impossible to see in the dark (H54) Blindness — the brain does not receive optical information, through various causes (H54/B73) River blindness — blindness caused by long-term infection by a parasitic worm (rare in western societies) (H54.9) Micropthalmia/coloboma —