Subcapsular Cataract Symptoms, Causes & Treatment Options
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What is Subcapsular Cataract?
The natural lens of the eye is covered by a thin outer layer called the capsule. When the clouding develops just beneath this capsule, it is called a subcapsular cataract.
There are two main types:
- Posterior Subcapsular Cataract (PSC) – This forms at the back of the lens, just in front of the posterior capsule. It is more common.
- Anterior Subcapsular Cataract (ASC) – This develops at the front part of the lens, just under the anterior capsule. It is less common.
Posterior subcapsular cataract causes more glare and usually affects reading vision compared to other cataracts. Anterior subcapsular cataract is caused by eye injury, inflammation, or certain metabolic conditions.
It is also important to understand the difference between posterior polar cataract and posterior subcapsular cataract. Posterior polar cataract is a congenital condition where the opacity is attached to the back capsule and may have a weak capsule. Posterior subcapsular cataract, on the other hand, develops just in front of the capsule and is usually acquired later in life.
Causes of Subcapsular Cataract
There are several causes and risk factors.
- Ageing
- Diabetes
- Long-term steroid use
- Eye injury
- Previous eye inflammation
- Radiation exposure
- High myopia
- Family history
Posterior subcapsular cataract is more commonly seen in people who are on steroids for asthma, arthritis, or autoimmune diseases.
Symptoms
Treatments
Symptoms
Symptoms of Subcapsular Cataract
Common symptoms of anterior and posterior Subcapsular Cataract include:
- Difficulty in reading
- Glare from headlights while driving at night
- Increased sensitivity to bright light
- Blurred near vision
- Seeing halos around lights
- Frequent change in spectacle number
In posterior subcapsular cataract, near vision is often more affected. Patients may say that reading has become really difficult, even though distance vision still seems okay initially. In early posterior subcapsular cataract, symptoms may be mild, but glare and difficulty in bright light are often the first complaints.
In an anterior subcapsular cataract, symptoms may vary depending on the size and position of the opacity.
Treatments
Treatment Options for
Subcapsular Cataract
In the early stage, mild cases can be managed with updated spectacles and proper lighting for reading.
However, since posterior subcapsular cataract affects vision significantly even when small, surgery is often required earlier compared to other types.
Cataract Surgery
Surgery for anterior and posterior subcapsular cataract involves:
- Removing the cloudy lens
- Replacing it with an artificial intraocular lens (IOL)
The procedure is usually done by phacoemulsification under local anaesthesia. It is painless and takes about 15–20 minutes in most cases.
If left untreated for a long time, posterior subcapsular cataract complications may include severe vision loss, difficulty in daily activities, and, rarely, secondary problems like increased eye pressure due to advanced cataract.
How is Subcapsular Cataract Diagnosed?
The eye doctor will:
- Check visual acuity (distance and near vision)
- Examine the eye with a slit lamp microscope
- Dilate the pupil to see the back part of the lens clearly
During diagnosis, a posterior subcapsular cataract appears as a granular or plaque-like opacity at the back of the lens.
Posterior subcapsular cataract grading is done based on the size and density of the opacity and how much it affects vision.
If Posterior Subcapsular Cataract surgery is being planned, additional tests like eye pressure measurement, retina examination, and biometry for lens power calculation are done.
How to Prevent Subcapsular Cataract?
Some practical steps:
- Keep blood sugar under control if diabetic.
- Do not use steroids in the long term unless medically required.
- Wear sunglasses to reduce UV exposure.
- Do not ignore eye injuries.
- Get regular eye check-ups after 40 years of age.
Good control of systemic diseases like diabetes plays an important role.
Conclusion
Subcapsular cataract, especially the posterior type, can disturb daily activities early. The good thing is that treatment is safe and effective. If you notice frequent changes in spectacle number or increasing glare, do not ignore it. Early examination helps in the proper planning of treatment.
Frequently Asked Questions:
About Subcapsular Cataract?
What are the early symptoms of Subcapsular Cataract?
Early symptoms include glare from lights, difficulty reading, blurred near vision, and frequent changes in glasses.
At what age does a Subcapsular Cataract usually develop?
It is more common after 50 years of age.
What is the best treatment for Subcapsular Cataract?
Surgery is the only permanent treatment for Posterior Subcapsular Cataract once vision is significantly affected.
When is surgery required for a Subcapsular Cataract?
Surgery is advised when a cataract interferes with daily activities like reading, driving, or office work.
How long is the recovery after surgery for a Posterior Subcapsular Cataract?
Most patients recover functional vision within 2–3 days. Complete healing usually takes about 3–4 weeks.
What type of lens is best for Subcapsular Cataract?
The choice of an intraocular lens depends on patient needs. Monofocal lenses are most commonly used.
Can Subcapsular Cataract be prevented?
It cannot be fully prevented, but controlling diabetes, avoiding unnecessary steroid use, and protecting eyes from injury and UV light may reduce risk.
Does diabetes increase the risk of Subcapsular Cataract?
Yes. Diabetes increases the risk and may also cause faster progression.
