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Rose K International has further refined the Rose K™ lens and also markets the Rose K2 lens.

Mr Paul Rose further refined the Rose K™ lens to take into account the unusual corneal shape of keratoconus patient's, which require abnormal curves on the back of the lens to fit the cornea optimally.

With normal corneas the shape does not change dramatically from the centre out, but tends to change evenly in predictable amounts, and therefore with normal corneas the back surface of the lens can be designed with small incremental changes (e.g. eccentricity) over most of the lens with a peripheral curve at the edge, and usually this will achieve reasonable alignment with the cornea and a good fit.

However with keratoconus patients to achieve optimum alignment with the cornea, many curves are required on the back surface of the lens and often adjacent curves are very different. In steeper cones particularly, several curves are often required within the patient's pupil zone to achieve a good fit over the central area of the lens. Unfortunately each one of these curves gives rise to a slightly different focal point at the back of the eye. This causes the patient to experience ghosting around the object that they are viewing (like a TV with a poor reception) and this is worse the bigger the pupil is because more curves on the back surface of the lens come within the patient's pupil zone. Therefore night driving where the pupil is larger is very difficult for keratoconus patients. These multiple focuses are called aberrations.

The Rose K2 lens minimizes these aberrations by applying very small changes to the curves on both the front and back of the lens in an attempt to bring the light passing through the lens within the pupil zone to a single point.

Following extensive trials the best combination of aberration curves have been developed for computerized digital lathes to cut these very complex curves for the Rose K2 lens to give the best focus.

The new Rose K2 lens is being progressively introduced by Rose K manufacturers and distributors internationally.

PRODUCT

Rose K2 Lens

Rose K2 IC

Rose K2 Boston ES
(also available in other materials at no extra cost)

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