Week 1.04 CL Prefitting History

Question 1

Initial discussion

Answer 1

• Patent requirements
• Contact lens history
• History and symptoms

Question 2

Contact lens history

Answer 2

• Details of previous CL wear
• Type of lens (modality – daily monthly rigid, material silicone hydrogel)
• Solutions used
• Worn how often and for how long
• Reasons for stopping lens wear
• Previous problems with lenses
• Will need re-educating on hygiene, lens care, lens wear – assume nothing/bad habits

Question 3

If you increase/decrease sag what happens to the lens

Answer 3

Increase in sag —> tighter lens fit
Reduction in sag —> looser lens fit

Question 4

Effron grading scale

Answer 4

Artist
Advantage - simple
Disadvantage - not real artificial created

Question 5

CCLRU

Answer 5

Photographic
Advantages- reflects the real appearance of condition
Disadvantages - artefacts, hard to show desired severity levels

Question 6

Alcon grading scale

Answer 6

Combines photo with artist adaptation
Advantage - cover mostly common graded features
Disadvantages- less published research on reliability