Dry eye

Question 1

What are causes of dry eye?

Answer 1

1. Aqueous deficient:
   i. Sjogren:
   ii. Non-sjögren - lacrimal gland deficiency/obstruction, meds
2. Evaporative causes:
   i. Intrinsic - meibomian oil deficiency, lid disorders (blepharitis)
   ii. Extrinsic - vit A deficiency, contact lens
3. Environmental:
   - ageing, low blink rate, occupational environments (e.g. computer use)

Question 2

What is the treatment of dry eye?

Answer 2

gritty burning eye

Question 3

What are investigations

Answer 3

Schirmers test <10mm wetting after 5 mins

Tear film meniscus height

Question 4

What is the treatment?

Answer 4

Artificial tears
Punctal plugs - tears can’t drain away
Topical anti-inflammatory

Question 5

What is responsible for reflex tear fluid secretion?

Answer 5

lacrimal gland va PNS