CONTACT LENS PRODUCTS & OCULAR FIRST AID

Question 1

why do we need contact lens products

Answer 1

for maintenance of optical and physical properties of the lens
for indertion and removal
due to changes in the bacterial flora- which allows bacteria in the ocnjuctival flap

Question 2

What can a multipurpose contact lens product include

Answer 2

OFT CONTACT LENS SOLUTIONS

Question 3

what are the disinfectants/ antimicrobials

Answer 3

hydrogen peroxide- benchmark- 3%- need to neutralise in the end
PHMB- multipupose- low conc
amidoamine- cationic
alaxadine- mouthwash- cationic
polyquetrnium- also a disinfectant

Question 4

what’s a surfactant

Answer 4

Cleaner
helps with the rub and rinse step
also helps overnight
POLOXMER- common surfactant
works in three ways:
reduces biodern- disinfection
reduces bacterial/protein deposists
and sticks to lens- making it more comfortable

Question 5

whats a chelating agent

Answer 5

most common is edta- in eitherhydranate/ citrate form

-ve charged sights- remove protein and calcium deposists

Question 6

what’s a demulcent fam

Answer 6

new
water-soluble polymer e.g. hydroxypropylmethylcellulose
protects and lubricates mucous membrane surfaces
relieves dryness and irritation.

Question 7

whats Propylene glycol used for

Answer 7

moisturiser

enhances water retention on a hydrogel lens

Question 8

what do Tonicity and buffering agents do

Answer 8

Phosphates, borates, acetates and citrates
enable solutions to resist changes in ph
\stability/
make it more comfortable

Question 9

what would u record when a px comes in with an ocular emergency

Answer 9

px details- their name,address, dob, the date
corrected and uncorrected VA
any procedures and drug u used
any advice given
also if needs be must refer to HEs- also inform gp??

Question 10

which ocular emergencies may u need drugs for

Answer 10

1. Superficial foreign bodies- try removing with cotton bud-evert lids- may need anaesthetic. if many- irrigate. any imbedded refer. use fl to see dammage- if superficial- call back next day- if not gone- refer-
2. Harmful chemical agents
   
3. Adverse responses to drug instillation
3. Acute ocular pathology

Question 11

which chemical reactions do need to be aware of

Answer 11

acid-self limiting- preticipate- 3.5% sodium carbonate
alkali/ lime- 10% neutral amonium and for the alkali 3% boric acid or 2% acetic acid solution.
ammonium- water- refer

Question 12

whats fainting

Answer 12

syncope-
reduction of flow of o2 and blod to brain
therefore takes it tom the rest of the body
heart beat and breathing increases
bp reduces
faints/

3 causes: neurally mediated syncope, orthostatic hypotension and cardiac syncope.