Acuvue Oasys Multifocal Fitting Calculator
+0.75
+1.00
+1.25
+1.50
+1.75
+2.00
+2.25
+2.50
Recommended Starting Lenses
Right Eye (OD)
—
Left Eye (OS)
—
Suggested ADD Level: —
*Calculations include vertex correction for sphere powers > ±4.00D. This is a starting point based on the manufacturer's fitting guide. Professional assessment is required.
Professional Guide to Acuvue Oasys Multifocal Fitting
Fitting multifocal contact lenses requires precision and an understanding of the patient's visual needs. The Acuvue Oasys Multifocal Calculator is designed to streamline the initial lens selection process using the unique "Pupil Optimized Design" parameters of Johnson & Johnson Vision lenses.
How the Calculation Works
The calculator performs two primary functions to determine the best starting trial lens:
- Vertex Correction: For spectacle prescriptions greater than ±4.00 Diopters, the effective power of the lens changes when moved from the bridge of the nose (spectacle plane) to the cornea (contact lens plane). The tool automatically applies the formula Fcl = F / (1 – d * F) to ensure accuracy.
- ADD Level Mapping: Acuvue Oasys Multifocal lenses are categorized into three distinct ADD tiers:
- LOW: For spectacle ADDs of +0.75D to +1.25D.
- MID: For spectacle ADDs of +1.50D to +1.75D.
- HIGH: For spectacle ADDs of +2.00D to +2.50D.
Realistic Example
If a patient has a spectacle prescription of -5.00 Sphere with a +2.00 ADD and a vertex distance of 12mm:
- The vertex-corrected sphere power becomes -4.72D, which rounds to the nearest contact lens power of -4.75D.
- The +2.00 ADD falls into the HIGH category.
- The initial trial lens would be -4.75D HIGH ADD.
Clinical Tips for Success
When fitting Acuvue Oasys Multifocal lenses, consider these expert tips to improve patient satisfaction:
- Sensory Dominance: Always determine the dominant eye. If the patient needs improved distance vision, slightly decrease the ADD or increase the minus in the dominant eye. For near vision improvement, do the opposite in the non-dominant eye.
- Allow Settling Time: Let the lenses settle on the eye for at least 10–15 minutes before checking visual acuity. This allows the tear film to stabilize over the lens.
- Real-World Testing: Use a phone or a magazine rather than just a standard eye chart to assess "functional" vision.