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S O F T
T O R I C
C O N T A C T
L E N S E S
J A S M I N M O D I
B . O P T O M ( H J C O )
P U R S U I N G
M . O P T O M ( N S O )
Outline
• Let’s brush up things!
• Indication
• Criteria of dispensing
• Basic & toric contact lens fitting
• Troubleshoot
• Problem-solving flow chart
Warm-up discussion !
Toric stabilization
Empirical fit approach
Indication
• Don’t compromise go for Rx
• Best sphere will not satisfied
• Sphere cylinder ratio is 4:1
• Does not tolerate RGP
Criteria of use of Toric lenses
• Degree of astigmatism
dispense regarding demand
• Ocular Dominance
Uncorrected astigmatism is far more likely to be accepted by
patient is nondominant eye
• Assessment of patient’s visual need
More critical task , lesser the cylinder would prescribed
Fit assessment
• Good fit
Full corneal coverage , centration 0.5 mm movement quick return if
mislocated
Tight fit
Good centration , initially comfortable , no movement
Loose fit
Excessive movement , Poor centration , uncomfortable , lens orientation
unstable & Inconsitent
Toric fitting lens evaluation
• Step 1
Perform refraction
• Step 2
Write in( - ) Cylinder form e.g.-6.00/-1.75 *180
• Step 3
Find K reading & ADD 0.80 mm in the flattest meridian
7.90 mm
6.60mm
8.70mm
• Step 4
Select a trial lens as close to spectacle Rx
• Step 5
Assess contact lens (Coverage, Centration , Movement, Comfort )
Step 6 Assess rotation
For axis
finalization
LARS – Left Add
Right Subtract
CAAS – Clockwise
Add Anticlockwise
Subtract
Example
Spectacle refraction -6.00/-1.75 *180
Trial lens axis -5.50/-1.50*170
Rotate clockwise 10 degree
Final Rx will be of contact lens is
-5.50/-1.50 *10
Only rely on
Spectacle Rx
while ordering
lenses
• Difficult cases
Oblique cylinders
-2.0/-2.00*45
High cylindrical component
-2.00/-6.00*180
Avoid compensation of
greater than 20 degrees
Its indicates to having a
difficult relationship with
lens cornea
Conclusion
• With a better understanding of the forces that influence soft toric lenses on
the eye.
• Dynamic vision situations.
• The availability of silicone hydrogel torics has improved both comfort and
oxygen availability to the cornea. improving performance and patient
satisfaction.

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Soft Toric contact lens fitting (NSO).pptx

  • 1. S O F T T O R I C C O N T A C T L E N S E S J A S M I N M O D I B . O P T O M ( H J C O ) P U R S U I N G M . O P T O M ( N S O )
  • 2. Outline • Let’s brush up things! • Indication • Criteria of dispensing • Basic & toric contact lens fitting • Troubleshoot • Problem-solving flow chart
  • 3. Warm-up discussion ! Toric stabilization Empirical fit approach
  • 4. Indication • Don’t compromise go for Rx • Best sphere will not satisfied • Sphere cylinder ratio is 4:1 • Does not tolerate RGP
  • 5. Criteria of use of Toric lenses • Degree of astigmatism dispense regarding demand • Ocular Dominance Uncorrected astigmatism is far more likely to be accepted by patient is nondominant eye • Assessment of patient’s visual need More critical task , lesser the cylinder would prescribed
  • 6. Fit assessment • Good fit Full corneal coverage , centration 0.5 mm movement quick return if mislocated Tight fit Good centration , initially comfortable , no movement Loose fit Excessive movement , Poor centration , uncomfortable , lens orientation unstable & Inconsitent
  • 7. Toric fitting lens evaluation • Step 1 Perform refraction • Step 2 Write in( - ) Cylinder form e.g.-6.00/-1.75 *180 • Step 3 Find K reading & ADD 0.80 mm in the flattest meridian 7.90 mm 6.60mm 8.70mm
  • 8. • Step 4 Select a trial lens as close to spectacle Rx • Step 5 Assess contact lens (Coverage, Centration , Movement, Comfort ) Step 6 Assess rotation
  • 9. For axis finalization LARS – Left Add Right Subtract CAAS – Clockwise Add Anticlockwise Subtract
  • 10.
  • 11. Example Spectacle refraction -6.00/-1.75 *180 Trial lens axis -5.50/-1.50*170 Rotate clockwise 10 degree Final Rx will be of contact lens is -5.50/-1.50 *10 Only rely on Spectacle Rx while ordering lenses
  • 12. • Difficult cases Oblique cylinders -2.0/-2.00*45 High cylindrical component -2.00/-6.00*180 Avoid compensation of greater than 20 degrees Its indicates to having a difficult relationship with lens cornea
  • 13.
  • 14. Conclusion • With a better understanding of the forces that influence soft toric lenses on the eye. • Dynamic vision situations. • The availability of silicone hydrogel torics has improved both comfort and oxygen availability to the cornea. improving performance and patient satisfaction.