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Summary RGP lenses
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Notes on Rigid gas permeable lenses
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Contact lens studies notesHistory and Symptoms
Types of PX’s that will attend your practice:
- New CL
- Existing CL
- Lapsed CL
- Previously tried and failed
- CL wearer with an issue
New CL wearer
- RFV
- Last eye test
- Info about specs
- History of flashes/floaters/diplopia/headaches
- FGH
- FOH
- VDU use
- Allergies – preservative free solution
- Specific meds that can cause dry eye
- History of infections
About lenses
- Any previous CL
- Why do they want to try
- FT/PT/EW?
- Would be happy looking after and cleaning lenses
- Hobbies/ Occupation
- Driver?
Existing Contact lens wearer
- Do you know what lenses you are wearing?
- Name of solution?
- How do you clean and store lens?
- How long have you been wearing them?
- Have you ever had any problems wearing your contact lens?
- Any infections?
- Last aftercare/sight test?
- Are you happy with the lens you are currently on?
, Lapsed CL wearer
- Why did you stop?
- When did you stop?
- Do you know what lenses you were wearing?
- How often did you wear them when you had them?
*NEED TO FIGURE OUT WHAT WENT WRONG*
Previously tried and Failed with CLs
- Squeamish
- Could not manage I&R
- Cost
- Comfort
- Infections
- Vision not satisfactory
- Why did you stop?
- How long were you trialling?
- Do you know the name of them
Medications – cause dry eye
1. Beta Blockers
2. Anti - Histamine
3. Contraceptive
4. Acne Meds
5. Anti – depressants
6. HRT
Keratometry
1. Javal-Shiotz
2. Bausch & Lomb
, Why do we record K readings??- 7.90 @ 90
7.85 @ 180
Approx 0.25DC for every 0.05mm
Contact Lens Polymers
The ideal contact lens would be one with :
- Meet Cornea’s oxygen requirements
- Physiological inert
- Excellent vivo wetting
- Resist Spoilation
- Maintain good optical performance
If contact lens has these features then risk of infection will decrease and comfort will
increase
Soft Contact lenses
Cl materials are made from organic polymers which form long chains such as:
Carbon linking to
- H
- O
- N
- S
- CL
- FL
When 2 different monomers are polymerised the term CO POLYMER IS USED – Most Cl
are co polymers.
Contact Lens Modality
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