What is the capsular bag in the eye?
‘bag’, capsular A sack-like structure remaining within the eye following extracapsular cataract extraction or phacoemulsification. The implanted intraocular lens is placed within this structure to recreate the usual phakic state.
Is there a cure for posterior capsular opacification?
At present, the only effective treatment of PCO is Nd:YAG laser capsulotomy, which involves clearing the visual axis by creating a central opening in the opacified posterior capsule.
What happens to the lens capsule during cataract surgery?
In routine cataract surgery, the posterior lens capsule plays a pivotal role: It acts as a barrier to separate the anterior segment from the vitreous cavity, it supports the cataract nucleus during phacoemulsification, and it holds the IOL securely at the end of the case.
What is the human lens made of?
The crystalline lens is a clear, biconvex layer of the eye that is made up mostly of proteins. As much as 60% of the lens mass is made up of proteins—a concentration higher than almost any other tissue in the body.
Can vision worsen years after cataract surgery?
No, your vision generally doesn’t deteriorate after cataract surgery unless other problems arise, such as macular degeneration or glaucoma. In cataract surgery, the eye doctor (ophthalmologist) removes the clouded lens from your eye and replaces it with a clear, artificial lens.
How soon can posterior capsule opacification occur?
Posterior Capsule Opacification After Surgery It can occur within weeks or years after surgery. When cataract surgery is performed, the damaged cataract is removed, but the clear covering of the cataract (the posterior capsule) is left behind. This capsule provides protection for and keeps the new IOL in place.
How thick is the human eye lens?
Adler2 reported that the thickness of the normal human lens was 4 mm at the age of 20 years, 4.3 mm at the age 40 of years, 4.45 mm at the age of 50 years, 4.7 mm at the age of 60 years, and increased in thickness to beyond 4.7 mm after 60 years of age.
How does capsular bag distension syndrome ( CBDS ) occur?
Almost all cases are associated with continuous curvilinear capsulorhexis with an overlap all over the anterior surface of optic . CBDS occurs when fluid accumulates between the PCIOL and the posterior capsule, leading to distension of the posterior capsule with anterior displacement of the PCIOL.
Which is the best treatment for capsular bag distension?
Treatment most commonly entails Nd:YAG laser posterior and/or anterior capsulotomy. YAG allows for quick release of the trapped fluid and returning the IOL to its previous position, resolving the patient’s myopic shift and visual blurring. Openings are most commonly made in the posterior capsule.
What happens if the capsular bag is ruptured?
If the capsular bag is ruptured during cataract surgery, then the lens may be implanted in the ciliary sulcus. IOL efficacy is affected by design, material, and surface modification. As stated in the next section, efficacy is also affected by lens epithelial cells and aqueous humor (AH) proteins. Figure 17.16.
Can a lens be implanted in the capsular bag?
A biocompatibility system diagram for an intraocular lens is given in Fig. 17.16. We assume that the lens is implanted in the capsular bag. If the capsular bag is ruptured during cataract surgery, then the lens may be implanted in the ciliary sulcus. IOL efficacy is affected by design, material, and surface modification.