Sclera

Looks like

The tough white outer coat of the eyeball, visible as the white of the eye.

What it does

Holds the shape of the eye and anchors the eye muscles.

Keeping it well

Yellow sclera means jaundice; deep, boring eye pain with a dark red patch can be scleritis, often tied to autoimmune disease, and needs urgent review.

Its parts

• Right sclera
• Left sclera

Related conditions

• Blepharitis & styes
• Burst blood vessel in the eye (subconjunctival haemorrhage)
• Cataract
• Conjunctivitis
• Hyperthyroidism & Graves' disease
• Keratitis (corneal infection and ulcer)
• Keratoconus
• Presbyopia
• Retinal detachment
• Retinoblastoma
• Scleritis and episcleritis
• Sjögren's disease
• Squint & lazy eye
• Uveitis & iritis