H00-H59 Diseases of the eye and adnexa

H00-H06 Disorders of eyelid, lacrimal system and orbit

(H00.0) Hordeolum ("stye" or "sty") — a bacterial infection of sebaceous glands of eyelashes
(H00.1) Chalazion — a cyst in the eyelid (usually upper eyelid)
(H01.0) Blepharitis — inflammation of eyelids and eyelashes; characterized by white flaky skin near the eyelashes
(H02.0) Entropion and trichiasis
(H02.1) Ectropion
(H02.2) Lagophthalmos
(H02.3) Blepharochalasis
(H02.4) Ptosis
(H02.6) Xanthelasma of eyelid
(H03.0*) Parasitic infestation of eyelid in diseases classified elsewhere
- Dermatitis of eyelid due to Demodex species ( B88.0+ )
- Parasitic infestation of eyelid in:
  - leishmaniasis ( B55.-+ )
  - loiasis ( B74.3+ )
  - onchocerciasis ( B73+ )
  - phthiriasis ( B85.3+ )
(H03.1*) Involvement of eyelid in other infectious diseases classified elsewhere
- Involvement of eyelid in:
  - herpesviral (herpes simplex) infection ( B00.5+ )
  - leprosy ( A30.-+ )
  - molluscum contagiosum ( B08.1+ )
  - tuberculosis ( A18.4+ )
  - yaws ( A66.-+ )
  - zoster ( B02.3+ )
(H03.8*) Involvement of eyelid in other diseases classified elsewhere
- Involvement of eyelid in impetigo ( L01.0+ )
(H04.0) Dacryoadenitis
(H04.2) Epiphora
(H06.2*) Dysthyroid exophthalmos

(H15.0) Scleritis — a painful inflammation of the sclera
(H16) Keratitis — inflammation of the cornea
(H16.0) Corneal ulcer / Corneal abrasion — loss of the surface epithelial layer of the eye's cornea
(H16.1) Snow blindness / Arc eye — a painful condition caused by exposure of unprotected eyes to bright light
(H16.1) Thygeson's superficial punctate keratopathy
(H16.4) Corneal neovascularization
(H18.5) Fuchs' dystrophy — cloudy morning vision
(H18.6) Keratoconus — the cornea thins and changes shape to be more like a cone than a parabola
(H19.3) Keratoconjunctivitis sicca — dry eyes
(H20.0) Iritis — inflammation of the iris
(H20.0, H44.1) Uveitis — inflammatory process involving the interior of the eye

(H33) Retinal detachment — the retina detaches from the choroid, leading to blurred and distorted vision
(H33.1) Retinoschisis — the retina separates into several layers and may detach
(H35.0) Hypertensive retinopathy — burst blood vessels, due to long-term high blood pressure
- (H35.0/E10-E14) Diabetic retinopathy damage to the retina caused by complications of diabetes mellitus, which could eventually lead to blindness
(H35.0-H35.2) Retinopathy — general term referring to non-inflammatory damage to the retina
(H35.1) Retinopathy of prematurity — scarring and retinal detachment in premature babies
(H35.3) Age-related macular degeneration — the photosensitive cells in the macula malfunction and over time cease to work
(H35.3) Macular degeneration — loss of central vision, due to macular degeneration
(H35.5) Retinitis pigmentosa — genetic disorder; tunnel vision preceded by night-blindness
(H35.81) Macular edema — distorted central vision, due to a swollen macula

(H43.9) Floaters — shadow-like shapes which appear singly or together with several others in the field of vision

(H47.2) Leber's hereditary optic neuropathy — genetic disorder; loss of central vision

(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 ophthalmoplegia — 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) Hyperopia (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

(H53.0) 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
(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) micro-opthalmia/coloboma — a disconnection between the optic nerve and the brain and/or spinal cord.

(B36.1) Keratomycosis — fungal infection of the cornea
(E50.6-E50.7) Xerophthalmia — dry eyes, caused by vitamin A deficiency
(Q13.1) Aniridia — a rare congenital eye condition leading to underdevelopment or even absence of the iris of the eye