The lens can even use it’s mighty-morphing transformer powers to change shape and thus it’s focusing power! Some Cataract Terminology Phakic: When you have your natural lens Psudophakic eye: When a cataract is replaced with an artificial lens Aphakik eye: When a cataract is removed but isn’t replaced.Lens Anatomy We can’t go any further in our discussion without first describing the anatomy of the lens and how it sits in the eye.
You know, those yellow tinted-glasses that sport enthusiasts and hunters wear?
They work because all lens systems, including the eye, suffer from some degree of chromatic aberration.
The eye is the most amazing organ in the human body, and the lens is one of the most impressive structures within it!
Not only is the lens the densest tissue in the body (highest protein content and lowest water percentage) it also remains optically clear for years despite constant bombardment by light radiation.
The lens can become so big that it pushes the iris forward, placing the patient at increased risk for angle closure glaucoma.
With far-advanced cataracts the middle cortical layer (the chocolate layer) can liquefy and become milky white and the nucleus layer (the central peanut) gets hard and falls to the bottom of the capsular bag.
Accommodation Now, I just said that the lens is suspended by spoke-like zonules to the ciliary body. The ciliary body is a ring of muscle that sits directly underneath the iris.
You can’t see it directly by standard exam without using mirrors, but this ciliary body is important for two reasons: it produces the aqueous fluid that nourishes the eye and it controls lens focusing.
This eliminates chromatic aberration and the image appears sharper.