TORIC MULTIFOCAL SOFT CONTACT LENSES
| Material choices: |
ACCUSOFT PLUS (hioxifilcon B)
ACCUSOFT 53 (ocufilcon B) |
Lens Parameters
The Toric Multifocal Soft Contact Lens is available in the following parameters:
| |
ACCUSOFT PLUS |
ACCUSOFT 53 |
| Base Curves |
8.20, 8.50 & 8.75 |
8.20, 8.40 & 8.60 |
| Powers |
+4.00 to -7.00/.25D steps |
+4.00 to -7.00/.25D steps |
| Cylinder |
-0.75 to -3.00/.25D steps |
-0.75 to -3.00/.25D steps |
| Axis |
Any axis/1° steps |
Any axis/1° steps |
| Diameter |
14.5 |
14.5 |
| Add Powers |
Continuous add +0.75 to +2.00 (Low Add Series) continuous add +2.25 to +3.50 (High Add Series) |
Continuous add +0.75 to +2.00 (Low Add Series) continuous add +2.25 to +3.50 (High Add Series) |
| Central Add Zone |
1.9, 2.18mm & 2.50mm |
1.9mm |
|
Custom orders are always welcome.
Lens Design
The Toric Multifocal Soft Contact Lens is a back-surface, prism ballast lens, and have a translating range of powers which enable a patient to see near, as well as intermediate work and distance very distinctly. Most plus power in center, progressing to more minus in periphery.
Initial Lens Selection
Take patient's keratometer readings for your records and future reference.
- Convert the spectacle Rx to minus cylinder form
- Compensate the sphere power for vertex distance if the power is greater than 4.00 diopters
- Add +0.50D for the tear layer
- Determine the cylinder power; under prescribe the minus cylinder by approximately 20%. Keep the cylinder axis the same as the spectacle axis.
| K's |
SUGGESTED BASE CURVES/DIAMETERS |
| |
Accusoft Plus |
Accusoft 53 |
| 40.00 to 43.00 |
8.75/14.5 |
8.60/14.5 |
| 43.25 to 45.00 |
8.50/14.5 |
8.40/14.5 |
| Steeper than 45.75 |
8.20/14.5 |
8.20/14.5 |
|
Fit Evaluation
The Toric Multifocal is fit somewhat steeper than conventional toric hydrogel lenses due to the precision optics incorporated into the central 4.0mm of lens. Excessive lens movement may cause intermittent blurring of visual acuity after blinking or during rapid eye movement.
Acuity Evaluation
- The lens should center well with some movement, usually 0.5mm or less.
- If the visual acuity is no less than 20/30 allow your patient to wear the lens for at least ten (10) days before making any adjustments. Patient's perception of visual quality in some instances can change considerably after an adaptation period.
Perform an over-refraction on both distance and near using hand-held trial lenses. In any over-refraction, refract ONLY the sphere and when reordering add or subtract the result. Note any rotation of orientation marks.
Clinical Assessment
The ideal lens fits should exhibit good centration with approximately .50mm or less of lens movement in primary position.
