Lecture 7 Toric fitting and aftercare

Question 1

What is WTR astigmatism?
What is ATR astigmatism?

Answer 1

-vertical meridian is steeper

-horizontal meridian is steeper

Question 2

What type of lens should you give for lenticular astigmatism?

Answer 2

front surface toric

Question 3

What toric lens design do you get in RCL’s?

Answer 3

-front surface toric (used in residual astigmatism)

-Back surface toric (used for stabilisation)

-Bi-Toric

Question 4

What toric lens design do you get in soft lenses?

Answer 4

prism ballast (traditional, peri-ballast, reverse prism)

Dynamic stabilisation (dual thin zone, accelerated stabilisation)

Question 5

How can toric lens rotation effect vision?

Answer 5

*Stable rotation (permanent rotation): effects px vision. Vision will stay reduced.
*Rotation with blink (lens shift back again): effects px comfort. Vision will fluctuate.

Question 6

How can you correct rotation?

Answer 6

CAAS: clockwise add, anti-clockwise subtract

LARS: left add, right subtract