Fitting "HydroCone" is very straightforward and efficient. Fittings can be made in one of two ways:
The HydroMed for post-LASIK is easily fitted with a time saving set of simple fitting lenses. For post keratoplasty and irregular corneas, it is advisable to determine the first trial lens using our fitting advice service.
The fitting with trail lenses is generally recommended. Selecting the appropriate geometry: For Keratoconus grades 1 or 2, and/or a topography > 6.5 mm select the "HydroConeK12" as initial lens For Keratoconus grades 3 or 4 and/or a topography < 6.5 mm select the "FlexConeK34" as initial lens Modifications Increase the lens diameter according to the off-centring of the cone If the lens does not stay in place (centrally too flat or too steep) adjust r0 accordingly If the "K12" should sit to steep in the periphery, switch to "K34" by using the equal r0. If the "K34" should sit too flat in the periphery, switch to "K12" use an equal r0. If the back-surface geometry does not lead to a satisfied fit, or a special topography is required; the back surface can be individually parameterized using the "Orbiflex SxS".
The use of trial lenses is generally recommended
Selecting the appropriate geometry:
There are 3 different edge designs: M (medium, standard), S (steep) and F (flat).
Start with the medium design "M" and flatten or steepen in accordance with the flourorescein observations
If the back-surface geometry does not lead to a satisfactory fit, or a special topography is required, the back surface can be individually parameterized using the "Orbiflex SxS".
The diameter of the cornea of a newborn is on average 9.5mm. Corneal growth is completed at the end of the second year of life (approx. 11.7 mm). Measuring lenses: DIA = 12.50; BC: 7.40 / 7.80 / 8.20 Principles of fitting: Pediatric contact lenses, as with all lenses should show stable fitting behaviour. The Central optical zone should cover the entire area of the pupil. Since infants typically spend more time on their backs when compared to an adult, the centering of the lens will be different. Another key factor is the handling of the contact lens - to attach and to remove the lens: a small overall diameter simplifies this procedure.
|Age||BCOR (mm)||Diameter (mm)||Power (dpt.)|