Lens-Induced Glaucoma
When an advanced, swollen, or injured cataract itself drives eye pressure dangerously high. Prompt cataract surgery is usually the definitive cure.
Overview
Lens-induced glaucoma is a group of secondary glaucomas in which the eye's own natural lens, almost always an advanced or injured cataract, is the direct cause of a rise in eye pressure. Unlike most glaucomas, where the lens is an innocent bystander, here the lens itself is the culprit, which means that removing it usually resolves the problem.
There are three classic types, each with a different mechanism: phacolytic glaucoma, phacomorphic glaucoma, and lens-particle glaucoma. All three tend to cause a relatively rapid, often painful rise in pressure, and all three are treated by addressing the lens.
The Three Types
Phacolytic glaucoma
A very advanced, overripe (hypermature) cataract begins to leak liquefied lens protein through its capsule. That protein, along with the immune cells that come to clean it up, clogs the eye's drainage meshwork like sediment in a filter, causing pressure to climb. The eye is typically painful and red, with a dense white cataract visible.
Phacomorphic glaucoma
Here the cataract has grown large and swollen (intumescent). The bulky lens physically pushes the iris forward and jams the drainage angle shut, producing an angle-closure attack. This is essentially acute angle-closure caused by the size of the lens, and it is a close cousin of the narrow-angle glaucoma we treat with laser, except that the definitive fix is removing the lens.
Lens-particle glaucoma
After the lens capsule has been broken, by an injury, or occasionally as a complication of eye surgery, small fragments of lens material are released into the front of the eye. These particles clog the drainage meshwork and raise pressure. Treatment involves controlling the inflammation and pressure and clearing the retained lens material.
Symptoms
- Sudden or rapidly worsening eye pain and redness
- A marked drop in vision, often with a dense, visible cataract
- Halos around lights, headache, and nausea when pressure is very high
- Usually one eye, in someone with a known advanced cataract or a recent eye injury
How Common Is It?
Lens-induced glaucoma is far less common in places with ready access to cataract surgery, because cataracts are usually removed long before they become advanced enough to cause it. It is seen more often when a cataract has been left untreated for years until it becomes hypermature or swollen.
That said, it remains an important cause of acute, painful glaucoma worldwide, and any glaucoma specialist must recognize it quickly, because the treatment is specific and time-sensitive.
Genetics & Risk Factors
Lens-induced glaucoma is not inherited. The main risk factor is simply having a cataract that has been allowed to advance, either because it went unevaluated or because surgery was delayed. Eye trauma that ruptures the lens capsule is the other major risk factor, particularly for lens-particle glaucoma.
Because the underlying driver is an advanced cataract, the strongest protection is timely cataract evaluation, one more reason not to postpone care for a cataract that is clearly worsening.
Ocular Findings on Exam
On examination, the eye pressure is typically very high, and the front of the eye shows inflammation. The specific findings point to the type: a dense, milky-white hypermature cataract with leaked protein in phacolytic glaucoma; a shallow, crowded, closed drainage angle with a large swollen lens in phacomorphic glaucoma; and visible lens fragments in the anterior chamber after trauma or surgery in lens-particle glaucoma.
Gonioscopy (examining the drainage angle) and a careful look at the lens are central to telling these apart and choosing the right treatment.
Testing & Diagnosis
- Measurement of intraocular pressure
- Slit-lamp examination of the lens and anterior chamber for leaked protein, swelling, or fragments
- Gonioscopy to see whether the drainage angle is open or closed
- Optic nerve and visual field assessment once the eye is stable, to check for any glaucoma damage
- B-scan ultrasound when a dense cataract blocks the view to the back of the eye
Treatment Options
Lower the pressure urgently
The first priority is bringing the eye pressure down quickly with pressure-lowering drops and oral medication, and calming the inflammation with anti-inflammatory drops. This protects the optic nerve and makes the eye safer for surgery.
Remove the offending lens
The definitive treatment is cataract surgery to remove the advanced, swollen, or fragmented lens. Because the lens is the cause, taking it out usually resolves the pressure problem. These can be more complex than routine cataract surgery, which is where a glaucoma specialist's surgical experience matters.
How This Differs From Other Glaucomas
What sets lens-induced glaucoma apart is that it is one of the few glaucomas with a true cure: because the natural lens is the direct cause, removing it typically fixes the underlying pressure problem rather than just controlling it. Most other glaucomas are managed long-term; this one is often resolved.
It is also distinctive for how urgently it must be handled. Phacomorphic glaucoma in particular behaves like an acute angle-closure emergency, and phacolytic glaucoma can spike pressure high enough to threaten vision within a day, so prompt recognition and prompt cataract surgery are what protect the eye.
The takeaway: a sudden, painful rise in eye pressure in an eye with an advanced cataract, or after an eye injury, may be lens-induced glaucoma. It is very treatable, and often curable, but it is time-sensitive. Do not let a worsening cataract go unevaluated.
Frequently Asked Questions
What is lens-induced glaucoma?
Lens-induced glaucoma is a group of secondary glaucomas in which the eye's natural lens, usually an advanced or injured cataract, is the direct cause of raised eye pressure. It includes phacolytic, phacomorphic, and lens-particle glaucoma. Because the lens is the problem, removing it with cataract surgery typically resolves the glaucoma.
What is the difference between phacolytic and phacomorphic glaucoma?
In phacolytic glaucoma, a very advanced (hypermature) cataract leaks protein that clogs the eye's drainage meshwork. In phacomorphic glaucoma, a large, swollen cataract physically pushes the iris forward and closes the drainage angle, an angle-closure mechanism. Both raise pressure, but through different routes, and both are treated by removing the cataract.
Is lens-induced glaucoma an emergency?
It can be. These conditions often cause a rapid, painful spike in eye pressure that can threaten the optic nerve within hours to days. Eye pressure is first lowered urgently with medication, then the underlying cataract is removed promptly, often within days, to prevent lasting optic nerve damage.
Can it be cured?
Usually, yes. Because the lens is the root cause, cataract surgery to remove it is generally curative for the pressure problem. If repeated or prolonged pressure spikes have already damaged the optic nerve, that glaucoma is then managed separately, but catching it early usually means an excellent outcome.
How is it prevented?
The best prevention is not letting a cataract become overly advanced. Having cataracts evaluated and treated before they become hypermature or intumescent (swollen) avoids the situations that lead to lens-induced glaucoma, which is one more reason not to delay a cataract that is worsening.
See a glaucoma specialist. Dr. Robert Gunzenhauser is Harvard-educated and UCLA fellowship-trained in glaucoma, providing expert diagnosis and treatment for Lens-Induced Glaucoma at Inland Glaucoma Center in Upland, CA.