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ICON Multifocal

The ICON Multifocal design is based on the back surface geometry of the ICON Aspheric Single Vision lens, with an aspheric centre distance front surface.

GP Design
Aspheric
Multifocal
Centre/distance

– ICON Multifocal

Overview

The ICON Multifocal design is based on the back surface geometry of the ICON Aspheric Single Vision lens. An aspheric centre distance front surface generates an increasing positive power towards the periphery, while the varifocal effect is achieved in two ways:

  • By simultaneous vision
  • By the contact lens’ natural tendency to translate on downgaze

A nominal +0.50 should be added to the patient’s spectacle reading add for optimal near vision.

ICON Multifocal offers excellent vision and comfort and is perfect for:

  • Patients requiring a budget multifocal option
  • Upgrades from traditional C3 and C4 designs

– ICON Multifocal

Parameters

Materials
No7 recommends the Optimum rage of materials. Other materials available on request.
Dk XO=200, Range 6/EO=58, Range 3
Powers -25.00 to +25.00D in.025 increments / Cyl -0.25 to -12.00
Add +0.50 to +3.50 in 0.25 steps
Average Thickness

0.18mm across all minus powers

 

Diameters 9.30 and 9.80mm on all powers
Base Curves 7.00-9.00mm in 0.05mm increments

– ICON Multifocal

Fitting Guide

     

    Selecting base curve
    • < 1.50D of corneal cyl fitted on flattest K
    • Between 1.50 and 3.00D of corneal cyl fitted 0.1mm steeper than flattest K
    • > 3.00D of corneal cyl fit Quasar FS
    Selecting diameter
    • 9.80mm diameter as standard
    • 9.30mm diameter available for smaller corneas
    Ideal fit
    • Alignment fluorescein pattern in central zone
    • 0.5mm band of edge clearance at periphery
    • 1-2mm movement on blink
    • Lens must be central or slightly low in primary position
    Flat fit
    • Excessive movement
    • > 0.5mm fluorescein band at periphery due to edge stand-off
    • Poor comfort
    • Central touch
    Steep fit
    • Fluorescein pooling under central zone
    • Reduced movement
    • Inadequate peripheral stand-off
    Over refraction
    • Should be done monocularly
    • Ensure lens is not high riding before carrying out over refraction
    • Find maximum plus/minimum minus for distance power
    To order
    • Provide K’s and spec Rx

    Here to help

    Got a question? Give us a call

    At No7 we have a proud reputation for industry leading customer support. Our friendly and experienced Technical and Professional teams are ready to help and advise you on any contact lens design or fitting questions you have. You can reach them on:

    - 01424 850620
    - technical.services@no7contactlenses.com
    - training@no7contactlenses.com