Conditions - ORBITS

Question 1

Lagophthalmos:

Answer 1

Incomplete closure of eyelids

Question 2

Ptosis:

Answer 2

droopy eyelid

Question 3

Eyelid Myokymia

Answer 3

(eye twitching): lack of sleep, stress, high caffeine intake, dry eyes (orbicularis oculi muscle)

Question 4

Plica semilunaris

Answer 4

Homologous to the nictitating membrane or third eyelid of lower Mammals
Allow lateral movements of eye

Question 5

Caruncle

Answer 5

Located medial to plica semilunaris
A highly vascular pink nodule of modified skin containing large nest of accessory lacrimal and sebaceous glandular tissue
Covered with epithelium that contains goblet cells

Question 6

Tear drainage system

Answer 6

LAC GL
LAC DUCT
EYE
LAC PUCTUM 
LAC CANAL 8mm
COMMON CANAL
LAC SAC
NASALSC DUCT 10mm
INF MEATUS/VALVE HASNER 12 mm

Question 7

Contraction of Orbicularis muscle, expands the sac, creates negative pressure and pulls tears form

Answer 7

canaliculus into nasolacrimal sac.

Question 8

Relaxation collapses the sac pushing tears into

Answer 8

nasolacrimal duct

Question 9

Mittendorf’s dot:

Answer 9

remnants of cloquet’s

cancal (CC)[regression of hyloid artery which supply blood to lens during development] posterior to the lens

Question 10

Begmeister’s papilla:

Answer 10

remnants of cloquet’s

canal anterior to optic nerve head (ONH)

Question 11

Accommodation:

Answer 11

the lens changes shape to focus for close up or distance vision spasm, excess, infacility (transient blur, slow responsive accommodation)

Question 12

Presbyopia,

Answer 12

loss of accommodation

Question 13

Adenocarcinoma:

Answer 13

malignant glandular epithelial cells

Question 14

Sub-tenon’s

Answer 14

injection to treat post cataract surgery inflammation.