A mature cataract is one in which the lens has become completely opaque — on examination the pupil looks white or milky, and the patient can usually only perceive hand movements or light. A hypermature cataract is a very long-standing mature cataract where the lens cortex begins to liquefy or the capsule wrinkles. Both are common in our setting when patients present late, and both need careful handling.

Types of Advanced Cataract

Mature cataract

All layers of the lens — nucleus, cortex, and the whole lens matrix — are opaque. No red reflex is visible. The rest of the lens structure is preserved, so surgery is straightforward once visualisation is managed.

Hypermature Morgagnian cataract

The cortex liquefies into a milky fluid, and the hard brown nucleus sinks to the bottom of the capsular bag. This is classic in long-untreated cataracts and can leak lens proteins into the eye.

Hypermature shrunken cataract

The opposite extreme — the lens shrinks, the anterior capsule wrinkles, and zonular support becomes weak.

Intumescent cataract

A swollen white cataract where the capsule is under pressure from fluid inside the lens. Particularly tricky — when the capsulorhexis is begun, fluid can escape rapidly and cause the tear to extend (“Argentinian flag sign”).

Risks of Leaving an Advanced Cataract Untreated

• Phacolytic glaucoma — leaking lens proteins block the drainage channels, causing sudden painful rise in eye pressure
• Phacomorphic glaucoma — the swollen lens pushes the iris forward and closes the drainage angle
• Lens-induced uveitis — inflammation from leaked lens material
• Dense amblyopia in paediatric cases
• Psychosocial impact — falls, loss of independence, depression

Pre-operative Assessment

When the cataract is white, we cannot see the retina on standard examination. We therefore do:

• B-scan ultrasound — to exclude retinal detachment, vitreous haemorrhage, large posterior segment tumours, and to assess axial length
• Anterion biometry — modern swept-source biometry often succeeds where older optical biometers fail, because it penetrates the dense cataract better; see our Anterion page
• Detailed anterior segment examination — to check for synechiae, pseudoexfoliation, zonular weakness
• Intraocular pressure — to rule out lens-induced glaucoma
• Consultation — honest discussion about realistic visual recovery when posterior segment status is uncertain

Surgical Approach

Advanced white cataracts can be removed safely by either phacoemulsification or manual small incision cataract surgery (MSICS). The choice depends on nuclear hardness, available biometry, and patient factors.

Specific intra-operative steps

• Trypan blue capsule staining — makes the anterior capsule visible against the white lens
• Careful capsulorhexis — small, controlled tear, sometimes with cohesive viscoelastic to decompress an intumescent lens first
• Gentle hydrodissection — especially in Morgagnian cataracts where the posterior capsule may be fragile
• Chopping techniques rather than sculpting in phaco, to reduce ultrasound energy
• MSICS is often our preferred approach for very hard brunescent nuclei — safer, faster, and comparable visual outcomes
• Capsular tension ring if pseudoexfoliation or zonular weakness is present
• IOL placement — monofocal IOL in the bag wherever possible; sulcus or scleral-fixated IOL if the capsular support is compromised

What to Expect After Surgery

For most patients with healthy retinas, vision recovery after white-cataract surgery is dramatic. Swelling of the cornea is more common than after a routine case and may take a few extra days to settle. If the posterior segment was not fully assessable before surgery, final vision depends on the state of the retina and optic nerve, which can only be examined once the cataract is removed.

Prevention

The most effective prevention is not waiting. Cataract surgery today is routine, rapid, and delivers excellent outcomes — there is no benefit to letting the cataract “ripen” as older generations were told. Modern cataract surgery works best when the lens is not yet dense and white.

Frequently Asked Questions