Equine Uvea

Question 1

Uveal tract (4)

Answer 1

1. Iris
2. Ciliary body
3. Choroid
4. Vascular tunic

Question 2

Posterior epithelium of iris is continuous with

Answer 2

Non-pigmented epithelium (inner) of ciliary body.

Question 3

Sensory retina is continuous with the

Answer 3

ciliary body non-pigmented epithelium

Question 4

RPE (retinal pigmented epithelium) is continuous with

Answer 4

ciliary body pigmented epithelium (outer)

Question 5

Tapetum in horses is

Answer 5

Fibrous

-it’s cellular in small animal

Question 6

Zones of the iris (3)

Answer 6

1. Pupillary zone
2. Collarette of iris
3. Ciliary zone

Question 7

Another word for aqueous flare

Answer 7

Tyndall effect

Question 8

Congenital anomalies of uveal tract (6)

Answer 8

1. Aniridia
2. PPMs (Persistent pupillary membranes)
3. Iris hypoplasia-often mistaken for neoplasia
4. Anterior uveal cysts
5. ASD (Anterior segment dysgenesis)
6. Medulloepithelioma

Question 9

PPM, if touching lens, can cause

Answer 9

opacities, cataracts

Question 10

Iris hypoplasia r/o

Answer 10

neoplasia (melanoma)

Question 11

ASD (5)

Answer 11

Anterior segment dysgenesis

1. macrocornea (cornea globosa)
2. ciliary body cysts
3. congenital miosis
4. small corpora nigra
5. retinal dysplasia and detachments

Question 12

ASD in RMH may cause

Answer 12

AqH outflow probs-> glaucoma

Question 13

Uveal neoplasia in horses (2 commons)

Answer 13

1. Melanoma

2. Lymphoma