Week 5 - Modality of Wear Flashcards
Classification of different contact lenses by wearing schedule:
• Daily: Only worn during waking hours
• Flexible: mixture if daily wear and occasional night time wear
• Extended: Day and night time wear up to a week with a night off for cleaning
• Continuous: Day and night time wear up to a month
2021 Classification update stated what about planned and sporadic wear?
• Planned wear: Up to 30 days overnight where were px plans to sleep c lenses
• Sporadic lenses: overnight wear but where there is occasional overnight wear
What are the use cases for Conventional and daily wear?
Conventional
•Part time wearer
• Special parameters
• RGP lenses
• Special tints
1 day
• Part/full-time wear
• Non-compliant
• Avoids proper lens care
What are the use cases for 2-4week and 3-6month lenses?
2 - 4 Week Disposable
• Full or part-time wear
• Dry eye
• Poor compliance
3 - 6 month Replacement
• Part-time
• Borderline dry eye
• Compliant
What are the classifications for RGP’s and Soft lenses?
• RGP:
- As needed - can be 2-3 years
- Frequent replacement - regularly scheduled replacement (usually 6/12 or 1 year)
• Soft:
- Conventional - usually specialist lenses (can be up to 1 year)
- Disposable - up to 1 month
- Daily disposable - every day
Why should CLs be replaced?
• To reduce complications
• Simplifying cleaning - no protein removing tables
- Can be used for non-compliant Pxs
• Loss of dimensional stability over time
• Deposits
• Improve EW comfort (new CLs usually comfier)
Why can frequent replacement reduce complications?
• Complications often caused by CL spoliation
- Discomfort
- Papillary conjunctivitis
- Infections
- Acute red eye
What factors influence CL spoliation?
• Care and maintenance regime
• Wearing schedule
• Tear chemistry and other personal factors
e.g make up
What influences on CL life expectancy?
• Thickness
• Handling ability
• Environment
What are the many advantages of frequently replaced CLs?
• Reduced lens spoilation
• Reduced risk of infection
• Reduced incidence of papillary conjunctivitis
• Improved comfort
• Safer extended wear
• Spare CL availability
• Low replacement cost
• Reduced time, effort and cost of cleaning
• Favourable patient response
• Easy fitting
• Easy to change Rx
• Establishes link to practice
What are the advantages to daily disposables?
l
- Convenience, no cleaning
- Lower risk of infections than EW
- Lower risk of mechanical complications
- Good for occasional wear (cost efficient)
- Good for young Px’s
What are daily disposable’s disadvantages?
- Limited range of Rx (this is improving all the time)
- Cost (if worn frequently)
- Handling can be trickier - why?
What are the advantages to 2 and 4 weekly?
- Cost efficient for FT wear
- Easier handling
-Wider range of Rx’s available
What are the disadvantages to 2 and 4 weekly lenses?
-Cleaning regime
- Reduced comfort at end of lens lifespan (deposits on lens)
- Cost if lenses are often lost/damaged
What are some important points about SCL> 1 Month?
• 3, 6 or 12 months
• Can increase chance of infection
• Protein removers likely
• Reduced comfort can occur
• Not commonly used (1% in USA 2015)
• Specialised custom fits
• Expensive if lost but generally cost efficient
