What different types of cataracts are there?Types of cataracts
The three main cataract patterns in adults are nuclear, cortical and posterior subcapsular. They affect the centre, outer layers and back of the natural lens respectively. Cataracts can also follow an eye injury, be present from birth, or develop during childhood. Some eyes have more than one pattern.
The name helps describe what your optometrist or ophthalmologist sees. It does not, by itself, tell you how well you can see or when you need surgery. A small cloudy patch directly in the path of light can be more troublesome than a larger patch near the edge.
How do I read the illustrations?
The natural lens sits behind the coloured iris. It has a central nucleus surrounded by cortex. A very thin outer envelope, the capsule, has a front part (anterior capsule) and a back part (posterior capsule). A cataract is clouding within the lens, rather than a film over the eye.
Side view: left = anterior (iris); right = posterior (retina).
- NucleusClear central portion
- CortexClear outer layers
- Anterior capsuleThin front covering
- Posterior capsuleThin back covering
Each illustration pairs a front-on view on the left with a side optical section on the right. In the side view, the front of the lens is on the left and the back is on the right. A slit lamp—a microscope with a narrow beam of light—helps an examiner locate clouding within these layers.
These are simplified teaching illustrations, not clinical photographs. The iris has been left out to show the whole lens, and colours, opacity and layer boundaries are emphasised. Real slit-lamp views vary with lighting and pupil size; cloudy areas can appear dark when viewed against light reflected from behind.
What are the three main adult cataract patterns?
What is a nuclear cataract?
A nuclear cataract clouds and hardens the centre of the lens. With age, this centre may change from pale yellow to amber or brown. A distinctly brown nuclear cataract is called brunescent.
Distance vision and colour clarity may deteriorate. The glasses prescription can shift towards short-sightedness, sometimes temporarily making reading without glasses easier. This “second sight” does not mean the lens has become healthier.
What is a cortical cataract?
A cortical cataract affects the layers surrounding the nucleus. White wedges or spokes commonly extend inwards from the edge. These are sometimes called cuneiform opacities, meaning wedge-shaped.
Glare can be particularly noticeable, including from headlights. The effect depends on whether the spokes cross the pupil and on the lighting conditions. There is no fixed timetable for progression.
What is a posterior subcapsular cataract?
A posterior subcapsular cataract, often shortened to PSC, is a granular cloudy patch just inside the back capsule. Reading and glare in bright light can be troublesome even when the patch is relatively small. Some progress more quickly than typical nuclear cataracts, although the rate varies.
PSC can occur with ageing or alongside steroid exposure, diabetes or inflammation inside the eye. Its appearance does not prove a particular cause. Do not stop a prescribed steroid medicine without speaking to the prescribing doctor.
Are there different forms of cortical cataract?
Yes. Spokes are the most recognisable pattern, but an examiner may also describe waterclefts, vacuoles or lamellar separations. These describe fluid-filled clefts, small bubble-like spaces or separation between lens layers. They may accompany developing cortical clouding rather than represent entirely separate diseases.
The terms can overlap in the same eye. Keeping PSC separate makes its location easier to understand. A “posterior cortical” description needs the examination context; it should not automatically be interpreted as a posterior polar cataract.
What is an anterior subcapsular cataract?
An anterior subcapsular cataract is a fibrous cloudy patch just inside the front capsule. It can be associated with injury, inflammation or atopic disease, although a cause is not always identified. It differs from the small developmental anterior polar spot described below.
What do mixed, mature and white cataracts mean?
Mixed cataract means that more than one pattern is present—for example, nuclear yellowing together with cortical spokes. This is common. The two eyes can have different combinations and different degrees of clouding.
Mature describes extensive clouding rather than a separate cause. A mature cataract may look white; other very advanced cataracts are dark brown. Intumescent means that the lens is swollen. A white cataract is not necessarily swollen.
Hypermature describes further changes in a longstanding advanced cataract. In a Morgagnian cataract, the outer lens material becomes liquid and the dense nucleus can sink within it. These descriptions matter when planning surgery. They are not stages that everyone must pass through before treatment: a cataract does not need to become “ripe” before it can be removed.
What types of cataract can follow an eye injury?
Injury can produce a local patch, a distinctive pattern or widespread lens clouding. Changes may appear soon after the injury or much later. The same injury can also damage the iris, lens supports or retina, so the examination needs to look beyond the cataract.
If an injury has torn the thin lens capsule or weakened the fibres that hold the lens in place, cataract surgery can be more complicated than usual. The lens may be unstable, and a piece of cataract can fall towards the back of the eye during surgery. The surgeon may need extra steps to remove it safely, including a further procedure called a vitrectomy, sometimes during the cataract operation and sometimes later. Damage to other parts of the eye can also affect the plan and the eventual vision. These problems are possibilities, not something that happens after every eye injury.
What is a rosette cataract?
A rosette cataract has a star- or flower-like pattern, often in the posterior cortex after a blunt impact. A ball striking the eye is one possible mechanism. Not every blunt injury produces a rosette, and not every rosette has the same effect on vision.
What happens after a penetrating injury?
A sharp object or fast-moving fragment can breach the lens capsule. The resulting cataract may stay near the entry site or spread through the lens. A retained foreign body and damage elsewhere in the eye can change the urgency and treatment.
A retained iron-containing fragment can cause siderosis, iron deposition that may produce rust-coloured lens deposits and cataract. It can also damage the retina and other structures. This is different from copper-related chalcosis.
Severe electrical injury, lightning, chemical injury and substantial radiation or heat exposure can also cause lens changes. These are exposure-related causes, not single shapes that can be reliably identified from a picture alone.
Is a sunflower cataract caused by trauma?
A sunflower cataract is associated with copper deposits. After a penetrating injury, a retained copper-containing fragment can cause chalcosis, copper deposition within the eye. Copper may form a central disc with radiating petals on the lens capsule.
Sunflower changes can also occur without injury, in Wilson disease, a rare inherited disorder of copper handling. They should not be grouped with the usual blunt-trauma rosette. In Wilson disease, these deposits may have little effect on vision and can improve with treatment of the underlying condition. Assessment and management depend on the cause; the picture alone is not a diagnosis.
What types occur in babies and children?
Congenital means present at birth. Developmental cataracts become apparent as a child grows. Some small developmental opacities are only noticed during an adult eye examination. They may be inherited, associated with another condition, or have no identified cause.
What is a lamellar cataract?
A lamellar, or zonular, cataract affects a particular layer surrounding the central nucleus. There may be clearer lens material inside and outside the cloudy layer. The extent of clouding and its effect on vision vary.
What is an anterior polar cataract?
This is a small opacity at the front pole of the lens. Many remain small and do not need cataract surgery. Children still need assessment: associated focusing errors or unequal vision can affect visual development even when the spot itself is tiny.
What is a posterior polar cataract?
This is a well-defined opacity at the back pole of the lens, sometimes with concentric rings. It is distinct from ordinary PSC. It may remain relatively stable or become more visually significant with time.
Surgery for a posterior polar cataract has a higher risk of complications than routine cataract surgery. The cloudy patch can be firmly attached to, or part of, the thin back wall of the lens (the posterior capsule). Sometimes that wall is already weak. It can develop a hole while the cataract is being removed, allowing the clear gel behind the lens to come forwards. The surgeon may then need to remove some of this gel, a procedure called a vitrectomy. Occasionally, a piece of cataract can fall into the back of the eye and need another operation to remove it. Recognising this pattern before surgery helps the surgeon plan for these possibilities. Most posterior polar cataracts do not lead to all of these problems.
What is a sutural cataract?
This follows the Y-shaped seams where developing lens fibres meet. A small isolated sutural opacity may cause little difficulty, although other cataract patterns can coexist. The front and back sutures have different orientations.
What is a blue-dot cataract?
A blue-dot, or cerulean, cataract contains small bluish-white flecks within otherwise clearer lens material. It is often familial and may become more evident as a child or young person grows. Some remain mild; others progress or coexist with additional lens clouding.
Other childhood patterns include nuclear cataracts, affecting the central lens formed early in life, and total cataracts, involving most or all of the lens. A congenital nuclear cataract is not simply the yellow-brown ageing change shown in the adult illustration.
In babies, the key issue is whether enough clear light reaches the developing visual system. A significant cataract can cause amblyopia, reduced vision from abnormal visual development. Some cataracts need early treatment; others can be monitored with appropriate glasses and, when needed, amblyopia treatment.
Are there other unusual cataract patterns?
Two names sometimes appear in examination notes:
- Snowflake cataract: a rare pattern of pale cortical flecks, particularly in younger people with diabetes. Most cataracts in people with diabetes are not snowflake cataracts.
- Christmas tree cataract: colourful, highly reflective needle-like deposits within the lens. It can occur with ageing and is also associated with myotonic dystrophy. Its presence alone does not establish that diagnosis.
These less common appearances are useful clues when considered with age, medical history and the rest of the examination.
How is the type diagnosed?
An optometrist or ophthalmologist examines the lens with a slit lamp, often after dilating the pupil, and checks how the findings relate to your vision. The retina, cornea and other parts of the eye also need consideration. Symptoms alone cannot reliably identify a cataract type.
Does the type decide when I need surgery?
For most adults, the decision depends on the effect on everyday vision, the health of the rest of the eye, likely benefits and risks, and your preferences. The name or photograph alone is not enough. A mild cataract can often be monitored; new glasses or better lighting may help temporarily.
A central PSC may become troublesome before it looks large. A dense white, traumatic or posterior polar cataract may need particular surgical planning. Children have a different priority: protecting visual development.
For more about contributing factors, read What causes cataracts?. The cataracts overview explains symptoms and assessment, and the cataract surgery guide explains treatment.
Is “secondary cataract” another type?
After cataract surgery, the capsule behind the replacement lens can become cloudy. This is posterior capsule opacification, or PCO. It is sometimes loosely called a secondary cataract, but the removed natural lens has not grown back. It is also different from PSC, which develops in a natural lens that is still present.
When should I seek urgent eye care?
Seek urgent eye care after a significant eye injury or for sudden loss of vision, a painful red eye, new flashes with a sudden shower of floaters, or a curtain across your vision. These should not be assumed to be an ordinary cataract. Contact an urgent eye-care service or attend an emergency department. Do not rub or press on an injured eye, or try to remove an embedded object.
A white pupil in a baby or child needs urgent assessment. Cataract is one possible cause, but other serious conditions can look similar. Do not wait for a routine adult cataract appointment.
Sources and further reading
- National Eye Institute: types of cataract and cataract assessment and treatment.
- Healthdirect Australia: cataracts.
- American Association for Pediatric Ophthalmology and Strabismus: cataract and white pupil (leukocoria).
- National Eye Institute: urgent floaters and flashes; St John Ambulance Australia: eye injuries.
- American Academy of Ophthalmology EyeWiki: cataract, posterior polar cataract and white cataract.
- Pau H. Cortical and subcapsular cataracts: significance of physical forces. Ophthalmologica, 2006. Morphological terminology; mechanistic proposals should not be treated as settled fact.
- Soleimani and colleagues. All about traumatic cataracts. Journal of Cataract & Refractive Surgery, 2024.
- Confirmed ocular chalcosis: a clinical case report, 2018; University of Iowa: sunflower cataracts in Wilson disease.
- The sunflower cataract in Wilson disease: pathognomonic sign or rare finding?. Eye, 2016.
- Zou, Li and Liu. The status quo and advances in categorisation of congenital cataract. Eye Science, 2024.
- Kumawat and colleagues. Multicoloured opacities in cerulean cataract. BMJ Case Reports, 2019.
- University of Iowa: siderosis bulbi.
- Posterior polar cataract surgical review. Indian Journal of Ophthalmology, 2013.