Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Module 7 Uveal Tract And Lens > Lens > Flashcards

Lens Flashcards

1
Q

Where do the lens zonules go from to?

A

Ciliary processes of the ciliary body to the lens capsule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

During development of the lens where does it get its nutrition from?

A

Hyaloid artery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Where does the lens in an adult get its nutrition from and excrete it’s waste?

A

Aqueous

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is aphakia?

A

Absence of a lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which breeds can get the inherited form of persistent hyper plastic primary vitreous/ persistent hyperplastic tunica vasculosa lentis?

A

Staffy

Doberman

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

New lens fibres causing compression of the lens results in loss of hydration of the lens nucleus. What is this called?

A

Nuclear sclerosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Young puppies (few weeks old) can show opacities at the equatorial end of one or more suture lines in the lens. Does this remain in adulthood?

A

No, disappears within a few weeks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Congenital inherited cataracts are seen in which breeds (4)?

What condition are they normally associated with?

Do they progress?

What is the treatment?

A

Miniature schnauzer
Cocker spaniel
Golden retriever
WHWT

Microphthalmos

No

Don’t normally need surgery. Twice weekly atropine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Which breeds are predisposed to early developing cataracts?

Are these progressive?

A

Boston terrier
French bulldog
Staffy
Welsh springer

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which breeds are affected by posterior polar subcapsular cataract?

Do they progress

Do they normally affect vision?

What shape do they normally take?

A

Retriever breeds
Siberian husky
Large munsterlander
English and white setters

Progression minimal

No

Triangular/ Y shape

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is Mittendorf’s dot?

Where is it in reference to the suture lines?

A

Insertion of the hyaloid vasculature on the posterior lens capsule

Ventromedial to the suture lines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which breeds are prone to getting secondary cataract with PRA?

what age bracket?

A

English cocker spaniel
Miniature poodles

Middle aged

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is nyctalopia?

A

Decreased vision in dim light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Does retinal degeneration cause cataracts in cats?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What can diabetic cataracts cause?

Which breed is this common in?

A

Lens rupture and Phacoclastic uveitis

Or phacolytic uveitis

Labs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What can cause cataracts in orphaned puppies/ kittens?

A

Inappropriate milk substitutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Which cat breeds can get congenital cataracts?

Where in the lens?

A

Persian
British short hair

Nuclear

18
Q

What is the most common cause of cataract in the cat?

A

Uveitis

19
Q

When performing phacoemulsification atropine is used 12 and 2h prior to surgery. What condition should this not be used for and what medication should be used instead?

A

KCS

Tropicamide

20
Q

What other medication as well as atropine is used 12h prior to phacoemulsification?
Why?

A

Phenylephrine

Helps dilation

21
Q

Topical NSAIDs is applied every 30mins 4x 2h prior to phacoemulsification.
What does this do?

A

Prevents prostaglandin mediated intra operative miosis

Reduces the blood aqueous barrier breakdown

22
Q

Instead of using atropine in the eye prior to phacoemulsification, what other technique can be used?

A

Intracameral adrenaline

23
Q

Sodium hyaluronate, chondroitin sulphate and methylcellulose are examples of what?

A

Viscoelastics

24
Q

How long are usually are topical antibiotics used for post phacoemulsification?

A

7-10days

25
Q

How long are usually are topical anti inflammatories used for post phacoemulsification?

A

2-3 months

26
Q

Topical mydriatics are often used post phacoemulsification for what reason?

Which one?

A

Stabilise the blood aqueous barrier
Reduce synechia

Tropicamide

27
Q

Which breeds are predisposed to primary lens luxation (2)?

What age bracket?

A

Terriers
Border collies

Young- middle aged

28
Q

What is the word for wobbling of the iris?

A

Iridodonesis

29
Q

When using mannitol as an osmotic diuretic, what dose should be used?

A

Mannitol 10-20%

1-2g/kg IV over 20-30mins

30
Q

In the lens where are the cells which replicate (metabolically active area)?

A

Anterior epithelium on anterior surface

31
Q

Do the lens fibres have nuclei?

Is the lens hydrated or dehydrated?

A

No

Dehydrated

32
Q

What is this congenital disorder?

Which breed?

A

Persistent primary hyperplastic vitreous

Staffy
Doberman

33
Q

What are lens fibres made up of?

What do these change to in cataracts

A

Soluble crystallins

Insoluble crystallins

34
Q

What is the difference between a mature and immature cataract?

A

Mature cannot get tapetal reflection, immature can!

35
Q

Which condition is normally associated with intumescent cataract?

What can this cause?

A

DM

Phacoclastic uveitis

36
Q

What type of cataract is this (lens is in place!)?

Why does it have this appearance?

A

Hypermature cataract

Some leaking of lens- phacolytic uveitis

37
Q

What type of cataract is this?

A

Morgagnian

38
Q

What changes do crystallins undergo with ageing that causes opacity?

A

Oxidative change

39
Q

Inherited Posterior polar subcapsular cataracts start where?

Breeds?

A

Around the suture lines

Retriever breeds; labs, golden retrievers
Red & white setter
Munsterlander
Siberian husky

40
Q

What is the gene mutation for primary lens luxation?

What is the inheritance?

A

ADAMTS17

Recessive but carriers can get PLL

Module 7 Uveal Tract And Lens (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions