Eye Health Central

Rose K Fitting Guide

Rose K Fitting Guide
Gas Permeable Keratoconus Lens From

Rose K Fluorescein Pattern - Good fit

rose K Fluorescein Pattern

Step One: Start the trial fitting 0.2 steeper than the average of the K readings.

Step Two: If this is a new rigid lens wearer, it may be advisable to use an anesthetic. this quickens the fitting process and allows a more accurate assessment of the fluorescein pattern because of reduced tearing.

Step Three: Too much fluorescein will give false patterns - so be careful when instilling it.

rose K Fluorescein Pattern

Step Four: Trial fit for the base curve - but don't worry about the periphery at first. A light feathery touch at the apex of the cone is best. The rest of the pattern should look as close to alignment fir as possible.

Step Five: Next consider the peripheral fit. the trial lenses have a standard edge lift, but an increased or decreased edge lift on the same base curve can be ordered. If the central base curvelooks good but you have inadequate peripheral adge lift ( see inadeguate lift fig. ) then order increased edge lift. Conversely, order decreased lift if their is excessive peripheral lift ( see excessive lift figure )

rose K Fluorescein Pattern

Step Six: The standard diameter is 8.70mm but any diametert is available. Smaller diameters of 8.10 - 8.30 work well on steep corneas and on highly astigmatic corneas. A larger diameter will tend to make the lens ride higher.
Note: Cone lenses often have an inferior ride over the apex of the cone.

Step Seven: Do a careful over - refraction using 1.00D steps initially and then refine.

Further Detailed discussion of the Rose K lens by Mr Paul Rose - the designer

Technical Specifications:

B.C.O.R.: 4.75 - 8.00mm
Diameters: 7.90 - 10.20mm
Fully adjustable Peripheral system
Boston ES Material

For More details contact:


Unit 11 Avebury Court, Mark Road

Hemel Hempstead, Herts HP2 7TA


Tel:- 44 (0)1442-253456

Fax:- 44 (0)1442-253301

Email:- nova-cl@dircon.co.uk

Web:- novacontactlenses.com

New Zealand:

Corneal Lens Corporation NZ Limited.

Author: John Dreyer Optometrist Bsc(Hons), MCOPTOM, DipCLP
Created: 28 Apr 2015, Last modified: 4 Mar 2020