What is capsular bag?
The capsular bag is the capsule of the crystalline lens. This term applies especially to the capsule after removal of its content by extracapsular cataract extraction or phacoemulsification, usually through a circular anterior opening (capsulorrhexis).
Which is the thinnest part of the lens capsule?
Lens Capsule Its thickness varies with location. At the posterior pole, it is thinnest (approximately 3.5 μm) and does not appreciably increase with age; the thickness at the equator increases slightly with age, and on average is 7 μm.
Can an IOL be too large?
Due to the sheer small size of the lens and the larger IOLs commonly available for implantation, they may contribute to complications such as glaucoma when such a normal-sized (relatively large) IOL is implanted.
Are there different sizes of IOL?
The intraocular lenses (IOLs) commonly used today are 13.5 to 14 mm in diameter, and this diameter is considered by some to be unnecessarily large. Decentration and posterior capsular opacification score were 0.33 mm and 0.63 in 12.5 mm IOL, and 0.47 mm and 0.61 in 14.0 mm IOL.
What is Sulcus IOL?
The IOL is positioned in the ciliary sulcus and the optic is captured posteriorly through the anterior and posterior capsule openings. This maintains IOL centration and prevents formation of Elschnig’s pearl and visual axis opacification posterior to the IOL.
How thick is the anterior capsule?
results. All studied capsules were thicker anteriorly, continuously increasing with age from 11 to 15 μm in average at the anterior lens pole. Maximum thickness was located at the anterior midperiphery, increasing with age from 13.5 to 16 μm.
How thick is an 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.
Why is my IOL blurry?
This study confirms that uncorrected blurry vision is the main cause of dissatisfaction after presbyopia-correcting IOL implantation. The main identifiable cause of blurred vision was residual refractive error and dry eye syndrome.
What is the size of a cataract lens?
between 12 and 14 mm
The overall diameter of these lenses generally ranges between 12 and 14 mm. The size is chosen according to the anterior chamber diameter of the eye receiving the implant.
What is the function of the capsular bag?
The lens capsule, or capsular bag, contains the lens epithelial cells and the fiber cell mass. The epithelial cells are the active and metabolic aspect of the crystalline lens, while the fiber cell mass, composed of a cortex and nucleus, is responsible for the bulk lens phenotype.
How is capsular bag distension syndrome diagnosed?
Slit lamp anterior segment photos, right and left eye (for comparison), of an 86 year old male with capsular bag distension syndrome, right eye Diagnosis can be made at the slit lamp in the most obvious cases. Turbid, opaque fluid can be visualized between the IOL and posterior capsule (Figure 1).
What happens if the capsular bag ruptures during cataract surgery?
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.
What happens if the iol comes into contact with the capsular bag?
In most cases, the IOL comes only into direct contact with the capsular bag tissue, and resulting complications may include development of opacities in the anterior (ACO) or posterior (PCO) capsule, and capsular contraction. PCO remains the most significant late postoperative problem following cataract surgery.