Lens Fitting Guide

Spherical Soft Lenses


Fitting Procedure

• Full refraction and eye examination
• Keratometry
• Initial lens selection and assessment

A Good Fit

• Is comfortable
• Is centred well, even in upward gaze, with full coverage of limbus
• Provides adequate, smooth movement in all directions of gaze
• Displays smooth push-up test response
• Gives sharp, stable keratometry mires immediately after blinking

A Flat Fit

• May give poor centration
• May give unstable vision
• Can cause discomfort
• Try steeper BOZR (when available)

A Steep Fit

• Does not move adequately
• Resists push up test with lower lid
• Can cause blanching or nipping of limbal conjunctival vessels. (This should be avoided at all costs as it can lead to corneal complications)
• Try flatter BOZR (when available)

A Tolerance Trial

• Of 20 minutes or more allows a more accurate assessment of fit and comfort
• “Good fit” criteria should still apply

Over-Refract

• To determine the best sphere power which gives optimum visual acuity
• If visual acuity is variable or poor check for flat/steep fitting lens or the need of a cylindrical correction

Care System

• Please refer to Lens Care section

Technical Assistance

• For fitting advice and details of our computerised empirical calculation service please provide the patients ‘K’ readings, spectacle prescription and Back Vertex Distance and we will be happy to supply the finished lens specifications

Ordering diagnostic/initial lenses call 0800 336655

• Specify lens type, BOZR, total diameter, back vertex power, cylinder power and axis