lens

Question 1

The __ is the avascular fibrous collagen outer protective coating of the eye.

Answer 1

sclera

Question 2

The canal through which the optic nerve passes from the eye is the posterior __ and the part that can be viewed inside the eye is the __

Answer 2

scleral forman, optic disk

Question 3

The sieve-like strands of sclera passing across the optic disk is called the

Answer 3

Lamina cribrosa

Question 4

in dark races, where the anterior ciliary arteries pierce the sclera, 4mm posterior to the limbus, there may be a dot of

Answer 4

uveal pigment

Question 5

The _ is a thin layer of fine elastic connective tissues, containing numerous blood vessels that nourish the sclera

Answer 5

epidsclera

Question 6

The_ is dehydrated but has the ability to absorb a great deal of water, which makes it opaque. The _ is almost completely hydrated in its normal state.

Answer 6

cornea, sclera

Question 7

The_ is the innermost layer of the sclera that is delicately connected to the choroid.

Answer 7

Lamina Fusca

Question 8

The sclera gets its nutrition from the_ and _ vessels

Answer 8

episcleral, choroidal

Question 9

The sclera is generously innervated by the __ and therefore, inflammations of sclera are very painful

Answer 9

short and long postier scleral ciliary nerves

Question 10

Deep episcleral vessels can be differentiated from the conjunctival vessels by testing with _ because the deeper vessels will not whiten

Answer 10

neosynephrine 10%

Question 11

The_ is biconvex, avascular, transparent structure that changes shape, refracting light near and distance viewing

Answer 11

crystalline lens

Question 12

The lens is held in a position by its suspensory ligaments called

Answer 12

zonules

Question 13

The zonules are attached to the _ in the valleys between in the ciliary processes, and to the pars plana and vitreous face

Answer 13

ciliary body

Question 14

The _ is a semipermeable membrane surrounding the lens that allows the accommodative reflex to change the shape of the lens after the zonules relax.

Answer 14

Lens capsule

Question 15

The lens starts losing its elasticity or its ability to change shape at about 45 yrs old called

Answer 15

presbyopia

Question 16

A single layer of _ cells lie under the lens capsule anteriorly only

Answer 16

epitheliual

Question 17

The lens substance ( cortex & nucleus) is continuously produced and compressed centrally so the lens becomes _ throughout life.

Answer 17

larger and less elastic

Question 18

The _ is newly formed soft lens fibers, that have the highest concentration of water within the lens,

Answer 18

cortex

Question 19

The_ is the dense central area of old fibers in the lens

Answer 19

nucleus

Question 20

The lens consists of about 65% _& 35% _

Answer 20

water & protein

Question 21

The lens nuclei from center moving outward are

Answer 21

embryonic, fetal nucleus, infantile and adult nucleus

Question 22

The anterior upright and posterior inverted Y sutures where the lamellar fibers meet from both sides if the lens are formed during_

Answer 22

Fetal nucleus development

Question 23

The lens possesses no_ or _ after fetal developement

Answer 23

nerve intevasion, blood supply

Question 24

During fetal development, the _ nourish the lens

Answer 24

hyaloid artier and vein

Question 25

__ is white lens remnant on the posterior lens surface where the hyaloid canal attaches to the lens

Answer 25

mittendorf’s dot

Question 26

A_ is a lens opacity

Answer 26

cataracts

Question 27

Cataracts are _

Answer 27

lens edema, protein alteration nacrosis and disruption of the lens fibers