Objective 2 Flashcards
What are the changes associated with aging of the crystalline lens?
Presbyopia and cataract formation
From what source is most of the crystalline lens nutrition derived?
Aqueous Humor
What are the three main divisions of the crystalline lens?
the nucleus, the cortex and the capsule
What concurrent actions are required within the eye in order for accommodation to occur?
adjustment in lens shape and constriction or dilation of the pupil
Where is the crystalline lens located within the eye?
Within the posterior chamber -in front of the vitreous chamber and behind the pupil and the iris
What is the one thing about the crystalline lens that changes throughout life and why do these changes take place?
the lens becomes thicker because new cell layers are produced
In addition to the aging process, name two other situations that can contribute to the formation of an opaque, cataracts lens
Trama or congenital abnormalities
What is the name of the hard centre portion of the crystalline lens?
The nucleus
When the ciliary muscle contracts which releases tension on the zones of Zinn, what it the resultant action on the crystalline lens and what does this action allow?
The lens becomes more convex which allows the eye to focus at near.
The maximum amount that the crystalline lens can accommodate in diopters is referred to as?
Amplitude of accommodation
