Posterior capsular opacification can cause cloudy or blurry vision months or years after cataract surgery. A cataract cannot grow back after the cloudy natural lens has been removed, but the thin membrane behind the artificial lens can become cloudy. This condition is called posterior capsular opacification (PCO), and some people refer to it as a secondary cataract.
For patients across Arizona and New Mexico, an eye examination at Southwestern Eye Center can determine whether PCO or another condition is affecting vision. This guide explains the symptoms of PCO, how doctors diagnose it, when YAG laser treatment may help, and which warning signs require prompt care.
PCO After Cataract Surgery
During cataract surgery, an eye surgeon removes the cloudy natural lens and replaces it with a clear intraocular lens, or IOL. The surgeon leaves part of the clear lens capsule in place to support the new lens.
After surgery, remaining lens epithelial cells can move across the back of the capsule, causing it to become cloudy. This cloudiness is posterior capsular opacification. It develops behind the IOL rather than inside the artificial lens.
PCO can cause symptoms similar to those of the original cataract, which explains the term “secondary cataract.” However, it is not a new cataract, and the development of PCO does not mean the cataract surgery failed.
Symptoms of Posterior Capsular Opacification
PCO often causes a gradual change after vision initially improved following cataract surgery. Symptoms may include:
- Blurry, hazy, or foggy vision
- Glare or halos around lights
- Reduced contrast
- Colors appear less vivid
- Difficulty reading or recognizing details
- Trouble seeing street signs or driving at night
These symptoms cannot confirm PCO on their own. An eye doctor must examine the eye to identify the cause of the change.
Other Causes of Cloudy Vision After Cataract Surgery
Cloudy vision after cataract surgery does not always mean that PCO has developed. The timing, severity, and pattern of the symptoms help guide the evaluation.
Blurring during the early cataract surgery recovery period may be due to healing, temporary inflammation, dryness, or the eye adjusting to the IOL. Later vision changes can result from PCO, dry eye, an uncorrected prescription, or a condition affecting the retina or macula. Other eye problems can also cause blurry vision.
An examination is especially important when vision worsens after initially improving, affects only one eye, or begins interfering with reading, driving, work, or daily activities.
Diagnosing PCO
An eye doctor can examine the posterior capsule and determine whether its clouding is significant enough to affect vision. The evaluation may include a visual acuity test, a slit-lamp examination, pupil dilation, and an examination of the retina and macula. Your doctor may also check eye pressure or perform additional testing based on your symptoms and eye health.
This evaluation helps distinguish PCO from other causes of blurry vision and determines whether monitoring, YAG laser treatment, or another type of care is appropriate.
When YAG Laser Treatment May Be Recommended
Not every visible area of PCO needs immediate treatment. Mild clouding that does not affect vision or daily activities may only require monitoring.
An eye doctor may recommend YAG laser capsulotomy when PCO reduces visual clarity, creates disruptive glare, interferes with reading or driving, or prevents a clear examination of the retina. The decision depends on the amount and location of the clouding, the effect on your vision, and your overall eye health.
What to Expect During YAG Laser Capsulotomy
YAG laser capsulotomy creates a small opening in the cloudy posterior capsule so light can pass through more clearly to the retina. The American Academy of Ophthalmology explains that posterior capsulotomy is a laser procedure used to treat PCO after cataract surgery.
Eye doctors usually perform the procedure in an office or outpatient setting. Your care team may use drops to dilate the pupil and numb the eye’s surface. Pressure-lowering medication or an eye-pressure check may also be appropriate, depending on your eye health and the doctor’s protocol. 
During treatment, you sit at the laser while the doctor creates the opening in the capsule. You may see bright lights or hear clicking sounds. The laser portion generally takes only a few minutes, although the full visit takes longer because of preparation and monitoring.
Follow your doctor’s instructions about driving, medications, activities, and follow-up care. Dilating drops can temporarily blur vision and increase light sensitivity, so do not drive until your vision is clear and your care team says it is safe.
Vision After YAG Laser Treatment
Some patients notice clearer vision after the dilation wears off or over the next several days. The amount of improvement depends on whether PCO was responsible for the vision change and whether other eye conditions also affect sight.
Temporary floaters or mild irritation can occur after treatment. Less common risks include increased intraocular pressure, inflammation, retinal swelling, damage to the IOL, a retinal tear, or retinal detachment. Your doctor can explain how these risks relate to your individual eye health before recommending treatment.
The opening created in the capsule usually remains clear. However, any new or returning vision change still requires an examination because PCO is not the only condition that can affect vision after cataract surgery.
Routine Evaluation and Urgent Warning Signs
Schedule a routine eye evaluation if you notice gradually increasing cloudiness, glare, halos, faded colors, reduced contrast, or difficulty reading or driving after cataract surgery.
Contact your eye doctor immediately or seek urgent eye care if you experience:
- Sudden vision loss or a rapid decrease in vision
- A sudden increase in floaters
- Flashes of light
- A curtain, shadow, or missing area in your vision
- Severe eye pain
- Marked redness with worsening vision
These symptoms are not typical signs of routine PCO and may indicate a condition that needs prompt treatment. Do not wait for a routine online appointment if symptoms are sudden or severe.
Insurance Coverage for YAG Laser Capsulotomy
Insurance may cover YAG laser capsulotomy when it is medically necessary, but coverage and out-of-pocket costs vary. Your deductible, copay, coinsurance, provider network, and plan requirements can all affect the final cost.
Review Southwestern Eye Center’s accepted insurance information and contact your insurance plan for benefits specific to your coverage. The care team can also help you understand what information may be needed before treatment.
PCO Evaluation at Southwestern Eye Center
If cloudy vision, glare, or reduced contrast is affecting reading, driving, or daily life after cataract surgery, an eye examination can identify the cause and clarify your options. Southwestern Eye Center provides eye care for patients across Arizona and New Mexico.
Schedule an eye exam online to have your vision evaluated. If your symptoms are sudden or include urgent warning signs, contact an eye doctor immediately or seek urgent eye care instead of waiting for a routine appointment.