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Clinical Skills > Looking After Contact Lenses > Flashcards

Looking After Contact Lenses Flashcards

1
Q

What are the materials of soft lenses

A

Hydrogels

Silicone Hydrogels

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2
Q

What are the modalities of soft lenses

A

Dailies
2 - Weekly
Monthly
Annual

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3
Q

What are the materials of rigid lenses

A

PMMA - Not used routinely

Rigid Gas Permeable

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4
Q

What are the modalities of soft lenses

A

Annual

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5
Q

Contact Lens Wear - Do

A
  • Have regular check-ups as advised by your practitioner
  • Always wash and dry your hands prior to handling your lenses
  • Always rub, rinse and store your lenses in the recommended solution
  • Single-use lenses, which should be discarded after each wear
  • Always apply the same lens first to avoid mixing them up
  • Check the lens is not inside out before applying
  • Check the lens is not damaged before applying
  • Handle carefully to avoid damaging the lens
  • Apply your lenses before putting on make-up
  • Remove lenses then remove make-up
  • Keep your eyes closed when using hairspray or other aerosols
  • Replace your lens case regularly
  • Wear only the lenses specified by your contact lens practitioner and stick strictly to the recommended wearing schedule
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6
Q

Contact Lens Wear - Don’t

A
  • Use tap water, or any other water, on your lenses or lens case
  • Sleep in your lenses, unless specifically advised to by your practitioner
  • Use your lenses for swimming, hot tubs or water sports, unless wearing goggles
  • Share contact lenses or wear any lenses not specified by your practitioner
  • Wet your lenses with saliva
  • Put a lens on the eye if it falls on the floor or other surface, without cleaning and storing again
  • Re-use or top up solution – discard and replace with fresh solution each time lenses are stored
  • Wear lenses left in the case for more than seven days without cleaning and storing them in fresh solution
  • Wear your lenses when showering
  • Switch the solution you use, except on the advice of your practitioner
  • Use any eye drops without advice from your contact lens practitioner
  • Apply a lens if it is dirty, dusty or damaged
  • Continue to wear your lenses if your eyes don’t feel good, look good, or see well
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7
Q

Why do contact lenses need to be cleaned?

A

Build up of deposits
Lipid ( oils ) - Silicone Hydrogels = blurry vision
Protein – Hydrogels = discomfort
Hypersensivity (allergy)
Infection risk ( if too much protein build up ) - bacterial ( if you don’t clean your hands )

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8
Q

Acanthamoeba

A

are among the most prevalent protozoa found in the environment.
Soil, air, sewage, seawater, chlorinated swimming pools, domestic tap water, bottled water = LIVES IN WATER
Highly robust
Contact lens cases - gets contaminated, if theres lots i.e. build up = lives on lens, in eye, it scratches

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9
Q

What are symptoms of Acanthamoeba Keratitis

A

Sensitivity to light
Red eye
Painful
Reduced Vision

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10
Q

What may Acanthamoeba Keratitis lead to

A

Permanent loss of vision

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11
Q

What time frame can Acanthamoeba Keratitis progress within

A

Days ( 48 hours ) to weeks

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12
Q

What are the contact lens solutions for Soft lenses

A

Multipurpose solutions

Hydrogen peroxide

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13
Q

What are the contact lens solutions for RGP lenses

A

Abrasive cleaner

Conditioner

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14
Q

Multipurpose solution

A

Simple and convenient
Cleaning, disinfecting, storing
Clean, rub, rinse, store
Easy to use

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15
Q

Hydrogen peroxide

A

Metallic disc in case or tablet to neutralise the disinfectant before wear
Bleach
No adverse reaction to preservatives = no irritation
Disk at bottom, put hydrogen peroxide solution in case of disk, put lenses in, after 6 hours it will neutralise the peroxide

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16
Q

Abrasive cleaner

A

Remove lipids and mucus

Can enhance the disinfecting action of soaking solution

17
Q

Conditioner

A

Saline to rinse

Protein removing tablets

18
Q

Peroxide cleaner

A

3% Hydrogen Peroxide
Minimum of 6 hours
Rinse with saline in the morning

19
Q

RGP cleaner

A

Rub lenses with cleaner
Rinse with saline
Store in case with conditioning solution

20
Q

What does a contact lens teach do

A 
Aim to teach a new wearer 
How to handle lenses
How to know if the lens is inside out
To safely apply/insert the lens
To safely remove the lens
Includes how to clean the lenses as appropriate
21
Q

Key points in a contact lens teach - insertion and removal steps

A

Touching the lens, not the eye.
Good control of top lid needed – hold lashes
Lens applied to the cornea – when teaching the public we refer to it as the coloured part of the eye
Once lens touches the eye – don’t blink straight away
Have your patient look up, down, left and right
Let go of the lashes slowly

22
Q

What to say when telling px’s to remove contact lenses

A

Slide the lens part off the cornea and pinch the lens off the sclera

23
Q

Why isn’t PMMA lenses used routinely

A

Doesn’t allow much O2 to eye

24
Q

Which lenses are used for cleaning

A

Monthlys

25
Q

What are the two types of deposits that can build up on lens

A

Protein - comes from tears

Lipid - oils attached to lens

26
Q

Which lens is good at attracting lipids

A

Silicone hydrogels

27
Q

What does protein build up cause

A

Discomfort

28
Q

What happens if you get too much protein build up

A

Hypersensitivity - almost like an allergic reaction - eyelids tend to be affected as they are in contact with lens

29
Q

What are bumps on the eyelid called

A

Papillae

30
Q

What is giant papillary conjuntivitis

A

Got hypersensitivity - feels scratch
e.g. when you have hayfever.
It should be smooth but its bumpy

31
Q

What does Acanthamoeba like to feed on

A

Cornea in the eye, however the eye is very resilient, it might get to surface of eye but never to the cornea

32
Q

Why can Acanthamoeba be very dangerous

A

If someone gets a scratch in eye and its quite deep, the protective barrier gets compromised = Acanthamoeba feed onto cornea = bad infection

33
Q

What happens if theres Acanthamoeba on the contact lens case

A

It can build up ( contaminates ), a lot of it, spread, lens in the case, it can live and eat away on the lens

Clinical Skills (6 decks)

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