Posterior capsule opacification
Slit-lamp examination shows posterior capsule opacification involving the central visual axis.
Almaty, Astana, Shymkent
Secondary Cataract (Posterior Capsule Opacification)
from 26.000 ₸
About the service
Posterior capsule opacification is clouding behind an artificial lens after cataract surgery. When indicated, an Nd:YAG laser creates an opening in the capsule to clear the visual axis.
Who the service is for
Intraocular-lens selection
Glare, halos or reduced contrast developed after IOL implantation and interfere with daily activities.
VA
Visual acuity has declined and the ophthalmologist considers the degree of PCO consistent with the symptoms.
Retinal condition
The anterior and posterior capsules, IOL position and retinal condition allow YAG capsulotomy to be considered safely.
Cataract and lens condition
The patient needs differential diagnosis between PCO, retinal disease, glaucoma and IOL-related problems after cataract surgery.
Cataract and lens condition
Vision initially improved after cataract surgery but later became progressively cloudy again.
Control of intraocular inflammation
Nd:YAG capsulotomy is a minimally invasive laser procedure but it is not risk-free. Possible events include a temporary intraocular-pressure rise, inflammation, new floaters, laser pitting of the IOL, macular oedema and rarer complications such as retinal tear or detachment.
Myopia
Additional caution is needed in glaucoma or ocular hypertension, high myopia, previous retinal tears or detachment, uveitis, macular disease, unstable IOL position and when future IOL rotation or exchange may be required.
Control of intraocular inflammation
If vision became cloudy again after successful cataract surgery, or glare, halos or reduced contrast returned, arrange an eye examination. Bring the previous operative report and, if available, information about the implanted IOL, retinal disease, glaucoma , high myopia , uveitis and prior laser procedures.
Cataract and lens condition
Do not use eye drops marketed to “dissolve” secondary cataract without medical advice because drops do not create an optical opening in an opaque posterior capsule.
When urgent care is needed
Seek urgent eye care for sudden visual loss, severe pain, marked redness, flashes, a curtain-like shadow or a sudden increase in floaters. Sudden visual loss, flashes, a curtain-like shadow, severe pain or many new floaters require urgent assessment rather than routine YAG treatment.
Limitations and safety
Nd:YAG capsulotomy is a minimally invasive laser procedure but it is not risk-free.
Book a consultation
Stages
Stage 1
Consultation and history
The ophthalmologist reviews the date and course of the previous cataract operation and asks about glaucoma, high myopia, uveitis and retinal disease.
Stage 2
Eye examination
Visual acuity and intraocular pressure are checked, and IOL position and the posterior capsule are assessed by slit-lamp biomicroscopy; the fundus and OCT are assessed when indicated.
Stage 3
Laser treatment decision
If PCO is clinically significant and there are no contraindications, the doctor plans Nd:YAG laser capsulotomy and explains the expected effect and risks.
Stage 4
Eye preparation
Dilating drops and other topical medication may be used according to local protocol; the exact KazRIED regimen requires confirmation.
Stage 5
Laser capsulotomy
Laser pulses create a central opening in the opaque posterior capsule using sufficient but not excessive energy.
Stage 6
Postprocedure review
After treatment the physician individualises IOP monitoring, anti-inflammatory medication and follow-up according to risk factors.
Service benefits
Treatment of capsule clouding
The laser creates an opening in the cloudy posterior capsule when it obstructs the passage of light.
Keeping the existing IOL
Treatment of posterior capsule opacification usually clears the capsule without replacing the artificial lens.
No surgical incision
Standard laser posterior capsulotomy does not require a corneal incision or sutures.
Clearing the visual axis
When capsule clouding causes reduced vision, restoring the passage of light can improve image clarity.
Methods comparison · 1
Criterion
Secondary cataract / PCO
Primary cataract
True IOL opacification
What becomes opaque
Posterior capsule behind the artificial lens
Natural crystalline lens
Material or surface of the artificial lens
When it occurs
After cataract surgery at variable intervals
Before natural-lens removal
After IOL implantation, less common than PCO
Typical treatment
Nd:YAG capsulotomy when indicated
Lens removal + IOL implantation
Cause-specific; IOL exchange may be required
Does the IOL need replacement?
Usually no
No IOL is present yet
Sometimes, after precise diagnosis
Why the distinction matters
Unnecessary IOL exchange increases invasiveness
YAG does not treat a cloudy natural lens
Unnecessary YAG may complicate future IOL exchange
Secondary cataract / PCO
What becomes opaque
When it occurs
Typical treatment
Does the IOL need replacement?
Why the distinction matters
Posterior capsule behind the artificial lens
After cataract surgery at variable intervals
Nd:YAG capsulotomy when indicated
Usually no
Unnecessary IOL exchange increases invasiveness
Natural crystalline lens
Before natural-lens removal
Lens removal + IOL implantation
No IOL is present yet
YAG does not treat a cloudy natural lens
Material or surface of the artificial lens
After IOL implantation, less common than PCO
Cause-specific; IOL exchange may be required
Sometimes, after precise diagnosis
Unnecessary YAG may complicate future IOL exchange
Methods comparison · 2
Method
Nd:YAG capsulotomy
Monitoring;
Surgical capsulotomy
Treat another cause
When used
Visually significant PCO in a suitable patient
PCO is present but visual symptoms are minimal and function is adequate
Rare situations where laser is unsuitable or a dense membrane requires surgery
PCO does not explain symptoms or macular/retinal/IOL pathology is found
Advantage
No intraocular incision; standard adult approach
Avoids unnecessary intervention
Can address anatomically complex cases
Targets the actual cause of visual loss
Limitation / risk
Requires retinal/IOP assessment and attention to CME, retinal complications and IOL damage
Follow-up is needed if symptoms progress
More invasive than YAG; requires individual surgical planning
YAG will not restore vision if the main problem lies elsewhere
Nd:YAG capsulotomy
When used
Advantage
Limitation / risk
Visually significant PCO in a suitable patient
No intraocular incision; standard adult approach
Requires retinal/IOP assessment and attention to CME, retinal complications and IOL damage
PCO is present but visual symptoms are minimal and function is adequate
Avoids unnecessary intervention
Follow-up is needed if symptoms progress
Rare situations where laser is unsuitable or a dense membrane requires surgery
Can address anatomically complex cases
More invasive than YAG; requires individual surgical planning
PCO does not explain symptoms or macular/retinal/IOL pathology is found
Targets the actual cause of visual loss
YAG will not restore vision if the main problem lies elsewhere
Methods comparison · 3
Pre-YAG criterion
Visual acuity and refraction
Slit lamp / retroillumination
Why it is checked
Match symptoms with objective functional loss
Identify fibrosis, Elschnig pearls and visual-axis involvement
Especially important when
All patients
All patients
Внутриглазное давление
Оценить исходный риск повышения ВГД
Глаукома, офтальмогипертензия, повреждение зрительного нерва
Осмотр сетчатки
Не пропустить разрыв, отслойку и другую заднесегментную патологию
Высокая миопия, вспышки, мушки, ретинальный анамнез
ОКТ макулы
Исключить макулярный отёк, ЭРМ, ВМД и другие причины
Если степень PCO не объясняет снижение зрения или есть факторы риска
Положение и прозрачность ИОЛ
Не перепутать PCO с проблемой самой линзы
Децентрация, дислокация, подозрение на помутнение ИОЛ, возможный будущий обмен
Visual acuity and refraction
Why it is checked
Especially important when
Внутриглазное давление
Осмотр сетчатки
ОКТ макулы
Положение и прозрачность ИОЛ
Match symptoms with objective functional loss
All patients
Оценить исходный риск повышения ВГД
Не пропустить разрыв, отслойку и другую заднесегментную патологию
Исключить макулярный отёк, ЭРМ, ВМД и другие причины
Не перепутать PCO с проблемой самой линзы
Identify fibrosis, Elschnig pearls and visual-axis involvement
All patients
Глаукома, офтальмогипертензия, повреждение зрительного нерва
Высокая миопия, вспышки, мушки, ретинальный анамнез
Если степень PCO не объясняет снижение зрения или есть факторы риска
Децентрация, дислокация, подозрение на помутнение ИОЛ, возможный будущий обмен
Book an appointment
If vision has declined again after cataract surgery, book an examination at KazRIED. The doctor will assess the posterior capsule, IOL, intraocular pressure and fundus and determine whether YAG laser capsulotomy is appropriate or whether another cause needs treatment.
Procedure prices
Service name
Price
Laser discission of secondary cataract (per eye)
from 26 000 ₸
Ophthalmologist consultation (per consultation)
from 12 000 ₸
Ophthalmologist consultation, Candidate of Medical Sciences (per consultation)
from 19 500 ₸
Highest-category doctor / over 10 years' experience consultation (per consultation)
from 14 500 ₸
Visual acuity testing (per eye)
from 1 000 ₸
Biomicroscopy (per eye)
from 1 700 ₸
Ophthalmoscopy (per eye)
from 1 100 ₸
Non-contact tonometry (per eye)
from 900 ₸
Cirrus-HD macular OCT (per eye)
from 3 800 ₸
Spectralis posterior-segment OCT (per eye)
from 5 500 ₸
Our doctors
A team of experienced doctors across specialties.
Experience: 30 years
Ophthalmologist
Umbetiar Almas Bekimuly
Candidate of Medical Sciences; Highest-category ophthalmologist
Experience: 23 years
Ophthalmologist
Abelkarieva Zhanara Abdrakhmangalievna
Highest-category ophthalmologist
Experience: 49 years
Ophthalmologist, Laser Treatment Unit
Silkin Vasiliy Pavlovich
Highest-category ophthalmologist
Experience: 7 years
Ophthalmologist, Laser Treatment Unit
Shaykenova Asiya Dulatovna
PhD Student
Experience: 5 years
Ophthalmologist, Laser Treatment Unit
Gallamov Diyar Muratkalievich
Secondary cataract: causes and laser treatment
After phacoemulsification, the cloudy natural lens has been removed, and the artificial lens usually remains inside the preserved capsular bag.
Residual lens epithelial cells may migrate and proliferate on the posterior capsule, causing fibrosis, folds, or formations known as Elschnig pearls.
What is posterior capsule opacification?
If these changes affect the central optical zone, the patient may again notice hazy vision, reduced visual acuity, glare, halos, and reduced contrast.
This condition is called posterior capsule opacification (PCO), commonly referred to as a secondary cataract. It does not mean that the original cataract has “returned,” nor does it automatically indicate a problem with the IOL.
What is checked before treatment?
Before laser treatment, the clinician must confirm that the symptoms are caused by capsule opacification rather than a condition affecting the macula, retina, or optic nerve, elevated intraocular pressure, clouding of the IOL itself, or another cause.
How is posterior capsule opacification treated?
For clinically significant PCO in adults, the standard treatment is Nd:YAG laser posterior capsulotomy. Laser pulses create a central opening in the cloudy capsule.
IOL replacement is usually unnecessary if the artificial lens is clear, correctly positioned, and there are no other indications for intraocular surgery.
Additional advice and situations
Posterior capsule opacification
Typical PCO: gradual visual decline after initially successful surgery, central posterior-capsule opacity and stable IOL – consider YAG when indicated.
Intraocular pressure
PCO + glaucoma: assess baseline IOP and optic nerve; pressure prophylaxis and monitoring are individualised.
Myopia
PCO + high myopia / retinal history: evaluate peripheral retina and symptoms of flashes/floaters more carefully before YAG.
The macular area
PCO + macular disease: OCT helps estimate how much visual loss is capsular and what laser treatment can reasonably improve.
Intraocular-lens selection
Suspected IOL opacity or dislocation: do not perform YAG automatically; first determine whether IOL exchange or repositioning may be needed.
Anatomical features
Dense fibrotic membrane or unusual anatomy: the laser surgeon decides whether YAG is sufficient or a surgical approach is preferable.
Ophthalmologist consultation: If required before treatment
Consultation with Candidate of Medical Sciences: When booked with a physician of this category
Highest-category / >10 years consultation: Depends on the selected specialist
Visual acuity test: Assessment of visual acuity
Biomicroscopy: Examination of posterior capsule and anterior segment
Ophthalmoscopy: When indicated to assess the fundus
Non-contact IOP measurement: Intraocular pressure control
Cirrus-HD macular OCT: When indicated, if the reduced vision is not fully explained by the posterior capsule findings.
Spectralis posterior-segment OCT: Alternative OCT when prescribed
Facts and offers
Kazakhstan’s first specialized ophthalmology institute, operating since 1933.
Modern diagnostics and surgery using world-class equipment.
Leading ophthalmologists in Kazakhstan, scientists and experienced surgeons.
More than 30,000 operations and around 270,000 consultations annually.
Kazakhstan’s first specialized ophthalmology institute, operating since 1933.
Modern diagnostics and surgery using world-class equipment.
Leading ophthalmologists in Kazakhstan, scientists and experienced surgeons.
More than 30,000 operations and around 270,000 consultations annually.
Kazakhstan’s first specialized ophthalmology institute, operating since 1933.
Modern diagnostics and surgery using world-class equipment.
Leading ophthalmologists in Kazakhstan, scientists and experienced surgeons.
More than 30,000 operations and around 270,000 consultations annually.
Related services
Frequently asked questions
What is a secondary cataract?
The term usually refers to posterior capsule opacification, or PCO, which can develop after cataract surgery. The posterior capsule remains in the eye and usually supports the intraocular lens. The natural lens does not grow back, so this is not a recurrence of the original cataract.
Why does posterior capsule opacification develop after surgery?
Lens epithelial cells can remain within the capsular bag after cataract surgery. Over time, their migration, proliferation and transformation can cloud the posterior capsule and interfere with light reaching the retina clearly.
How long after cataract surgery can PCO develop?
There is no fixed interval. Posterior capsule opacification can become noticeable weeks, months or years after cataract surgery. If vision deteriorates again after a period of good postoperative vision, an eye examination is needed to identify the cause.
Does PCO mean cataract surgery was performed incorrectly?
No. Posterior capsule opacification is a recognised delayed consequence of cataract surgery and can develop after a technically successful procedure. Its occurrence does not by itself indicate surgical error or incorrect IOL implantation.
Does the artificial lens need to be replaced for PCO?
Usually not. In typical PCO, the IOL itself remains clear and in position. When treatment is indicated, an Nd:YAG laser is used to create an opening in the cloudy posterior capsule behind the IOL, clearing the central visual axis.
Is Nd:YAG laser capsulotomy painful?
It is usually performed as an outpatient procedure using topical anaesthetic eye drops and does not require a surgical incision. Significant pain is not expected, although patients may notice flashes of light or other brief sensations. Individual experience varies.
How long does Nd:YAG laser capsulotomy take?
The laser treatment itself is usually brief. The complete visit takes longer because the cause of reduced vision must first be confirmed, and pupil dilation, intraocular pressure measurement and post-procedure monitoring may also be required.
When will vision improve after Nd:YAG capsulotomy?
Many patients notice improvement quickly, sometimes soon after treatment, while vision may stabilise over several days in others. Pupil dilation can temporarily blur vision during the first hours. If the expected improvement does not occur, other ocular causes should be assessed.
Can secondary cataract recur after Nd:YAG capsulotomy?
After an effective capsulotomy, the central opening in the posterior capsule usually remains open, so typical PCO does not usually re-obscure the visual axis there. If vision later deteriorates again, other causes such as retinal or macular disease, glaucoma, corneal changes, IOL problems or another condition should be investigated.
Which symptoms after Nd:YAG capsulotomy require urgent care?
Urgent ophthalmic assessment is required for sudden or marked loss of vision, many new floaters, flashes of light, a shadow or curtain in the visual field, severe or increasing pain, or marked redness. These symptoms require assessment for raised intraocular pressure, inflammation, retinal tear or detachment and other complications.