Healthcare and Medicine Reference
In-Depth Information
Table 3 This table summarizes words related to the conjunctiva.
Conjunctiva-related defi nitions
Examples of use of term
Blepharoconjunctiv
Related to eyelid and
conjunctiva
Blepharoconjunctivitis
Conjunctivalisation
Abnormality of the cornea
where the epithelium resembles
that of the conjunctiva. Usually
related to limbal stem cell
defi ciency
Conjunctivitis
Infl ammation in the conjunctiva,
usually infectious in nature, but
sometimes due to rare immune-
mediated conditions
Ligneous, bacterial, viral,
allergy-based, chlamydial,
chemical/irritant
conjunctivitis
Keratoconjunctivitis
Infl ammation involving the
cornea and conjunctiva
Allergic keratoconjunctivitis
—atopic and vernal
keratoconjunctivitis,
keratoconjunctivitis sicca
(dry eye disease)
Membranous
conjunctivitis
A special type of conjunctivitis
where a 'membrane' is
visualised over the ocular
surface
Diphtheritic, pseudo-
membranous conjunctivitis
Table 4 This table summarizes words related to the sclera.
Sclera-related defi nitions
Episcleritis
Infl ammation of the episclera
Scleritis
Infl ammation of the sclera
Sclerokeratitis
Infl ammation of the sclera and cornea
Scleromalacia
Degenerative thinning of the sclera, commonly associated
with rheumatoid arthritis and collagen diseases
THE TEAR FILM
Preocular Tear Film
The tear fi lm is a mixture of ocular surface secretions from the main lacrimal
and accessory lacrimal glands, meibomian glands and the corneal and
conjunctival epithelium. The tear fi lm, as part of the ocular surface system,
has several roles that include the provision of a smooth refractive surface,
protection of the ocular surface with its antibacterial and immune functions,
supply of oxygen and removal of metabolites such as carbon dioxide,
lubrication, and clearance of cells, debris and foreign bodies in conjunction
with the eyelids (Van Haeringen 1981, Tiffany 2008).
The preocular tear fi lm is the fi rst structure that incident light encounters
on reaching the eye; so the air-tear interface is the fi rst refractive surface
 
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