23/24 diet 1 Notes Flashcards
(19 cards)
How to explain to a Px about SCL cleani g using multipurpose solution
- hygene - wash hands
- cleaning - drop 1-3 drops of multipurpose solution onto each side of the lens and rub for rough;y 20 seconds each side
- rinsing - rinse lenses with solution after rubbing. avoid using any water
4.storage - put new solution into case and place lenses into the case to disinfect the lenses over night. always make sure that the lens is fully submerged to prevent contamination and dryness.
advantages and whent to use hydrogen Peroxide solution
advatages;-
- effective disinfection - perfect for sterilizing lenses and killing bacteria, virus, fungi and is ideal for high risk patients
- no preservatives - suitable for px with allergic reactions and dry eye
When to use:-
- sensitive eyes
- High risk of infection
Questions to ask px to fully investigate symptoms
- when did you notice discomfort
- did you experience any discomfort with both eyes or just 1
- How long do you typicallly wear the lenses
- have you had a change in visio, irritation, redness of excessive tearing
- do you properly clean ypu lenses and replace the lens case regularly
How to explain contact lens peripheral ulcer to a px
This is a small sore on the edge of your cornea caused by a bacterial infection. this can occue when you are not cleaning your lenses properly and sometimes when they are wore too long without sufficent O2, can cause discomfort if left untreated and can lead to serious complications
Management plan:-
- stop wearing your lesnes immediately to allow the eyes to heal
- might have to prescribe antibiotic eye drops in order to help fight the infection
- well monitor your eyes closely with follow up appointments to ensure proper healing .
Advantages of using coreoscleral rigid lenses
- comfort and stability
- oxygen permiability
- visual clarity
- durrability
- lens diameter
Potential uses of corneal topography
- keratoconus detection
- pre - operative planning
- contact lens fitting
- monitoring disease progression
- post operative monitoring
Indications for Toric soft contact lenses
- Astigmatism
2.High astigmatism - Px lifestyle
- Irregular corneal shape
Limitations of a SCL
lens rotation
limited power range
stability
fit issues
Effects of an RPG on tear film
- Tear film disruption - RPG lenses can disrupt the natural tear film, leading to increased evaporation. of the tears, which may not cause dryness and discomfort, particularly if the lens does not fit well
- reduced tear exchange - may restrict the normal tear exchange beneath the lens, potentially leading to some dry eye symptoms if the ter film beneath the lens is insufficient
possible casuses of corneal infilterates in contact lenses
- bacterial infection
- hypoxia
- lens contaminations
- over night lens wear
Clinical signs of infilterative keratitis
- corneal staining
- peripheral corneal infiltrates
- redness and infection
- visual disturbance
features of staining seen on slit lamp and how to record
- location of staining - weatherit is central ot peripheral and area of said cornea affected
- severity and pattern - the degree of the staining and the pattern of the staining, which can indicate the cause and severity of the staining.
Ideal properties of contact lens materials
- oxygen permiability
- comfort
- biocompatability
- durability
- ease of handeling
process of injection moulding and advantages and disadvantages
process:
- involves a liquid polymer being injected into a mould under pressure. the polymer is then heated and allowed to cool and solidify into the shape of the contact lens, aftrer cooling the lens is re,oved form the mould.
Advantages: -
- percision and consistincy
- cost effective
- complex lens design
disadvantages:-
- lens material flexability
- initial setup control
- quality control
Feautres of a flat/loose fitting contact lens
- lens fit - sits to loose, to much movement upon blink and poor stability
- central lens loation- lens may be centrally displaced because it is not conforming well to the corneal curvature
- excessive movement - lens may move more than optimal 0.25-0/5 mm. upon blinking, ehich can cause discomfort and disrupt the tear exchange beneath the lens
- lens awareness - Px mahy exp increased lens awareness due to the movement of the lens on thre eye
Complacations of a loose/flat fitting lens
- discomfort anf irritation - excessive movement of the lens can cause friction to the cornea and lead to discomfort and potential irritation
- lens decentraction
- dryness and reduced oxygen
- increased risk of infection
Multifocal options
Monovision
multifocals
bifocal cls
why to review px record card pre appointment
- understadning px history
- track changes
- avoid repetation
- preparing for specific needs.
parameters tp verifiy on RGP aftercare
base curve
diameter
lens movement
lens centration
movement on blink
lens fit (normal/loose/tight)
