Symptoms of Dislocated Lens After Cataract Surgery

Cataract surgery is a low risk procedure. However, as with any clinical intervention, it can never be a “no risk” one. You might have heard of a very rare condition after a cataract operation, known as a dislocated lens.

The chances of this happening has a risk factor of anything between 0.2% - 3%. It can happen any time after surgery—either very soon afterward or years down the line.

The following looks at why lens dislocation happens, the symptoms, when it becomes an emergency, and what can be done to fix the problem.

Dislocated Lens After Cataract Surgery: everything you need to know

• Why a lens might dislocate after cataract surgery
• Symptoms of dislocated lens after cataract surgery
• When a dislocated lens is an emergency
• What can be done about a dislocated lens

Why a lens might dislocate after cataract surgery

A dislocated lens is exactly as it sounds—the intraocular lens (IOL) moves from its sited position. It occurs when the lens capsule in which the IOL is placed becomes ruptured, allowing the artificial lens to move. While lens dislocation is rare, there are some reasons that might mean you’re more predisposed to it happening:

• Eye disease: The most common is inflammation within the eye—a condition called uveitis. This causes the eye tissues to swell, which puts pressure on the lens and makes it shift out of position.
• Trauma to the eye: A physical injury to the eye or surrounding area could cause the lens to move.
• High myopia: Significant levels of near-sightedness.
• Certain underlying medical conditions: Such as connective tissue disorders.
• Having had prior surgery: Any previous retinal or eye surgery could make you more predisposed to a dislocated lens.
• Issues with the capsular bag: The IOL is fixed in place to the remains of the natural lens capsule. A rare condition known as pseudoexfoliation syndrome can cause this to become unstable and allow the lens to move.

Symptoms of dislocated lens after cataract surgery

Most dislocated lenses cause issues with your eyesight, rather than pain. There are three main symptoms. If it does occur, you might notice some or all of the following:

• Being able to see the edge of the lens
• Double vision
• Blurring

The level of symptoms will depend on how severely the IOL moves. Other, rarer, symptoms can occur in conjunction with the dislocated lens. These include:

• Bleeding.
• Pain from intraocular inflammation.
• Other eye irritation, such as watering, redness, grittiness, or feeling like there’s something in the eye.

In the worst cases, it can cause bleeding, retinal detachment, or other eye conditions, including glaucoma and edema within the eye.

When a dislocated lens is an emergency

Generally, a dislocated lens is not dangerous. However, it can occur in conjunction with retinal detachment—a sight-threatening condition where the thin layer of cells at the back of the eye begins to peel away. Symptoms of this include:

• A dark shadow, like a curtain, falling across your field of vision from the top or from an upper corner.
• The appearance of new floaters.
• Bright flashes of light.

If you experience any of these then this is a medical emergency that needs immediate assessment.

What can be done about a dislocated lens

Your cataract surgeon will first perform a detailed eye examination to determine how far the lens has moved. This may or may not include an ultrasound, depending on how good a view of the interior eye anatomy they can get.

Treatment will be dependent on how severe the movement of the IOL is. If there’s only slight movement and it’s not causing any vision issues, no treatment will be needed—your ophthalmologist will simply monitor the IOL during your regular eye exams.

In the case of significant eyesight deterioration, there are two surgical options available:

• IOL repositioning: The jelly-like substance within the eye is removed, allowing the surgeon to move the lens back into the correct position and secure it in place.
• IOL exchange: Removing the existing IOL and replacing it with a new one.

Which course of action is right will be determined by how far the lens has dislocated, the anatomy of your eye, the reason for the dislocation, and more. If it’s fallen into the vitreous cavity, it’ll be necessary for the surgeon to also perform a vitrectomy before moving or exchanging the lens. This is the removal of the jelly-like fluid within the eye. Afterward, a gas or clear fluid replaces the natural substance during the recovery period, and your body will naturally produce more vitreous that gradually takes its place.

Once again, we must reiterate that a lens dislocation is rare—although not unheard of. You should also be reassured by knowing that the prognosis is very positive, with most people being treated definitively and achieving the outcome they hope for—a return to great eyesight.

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