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Rose K Contact Lenses
Rose K Contact Lenses
Rose K & Rose K2 Contact Lenses
Contact Lenses for Keratoconus
Its complex geometry can be customized to suit each eye and can correct all of the myopia and astigmatism associated with keratoconus. The Rose K & Rose K2 Contact Lenses are easy to insert, remove and clean.
They provide excellent health to the eye, because they allow the cornea to "breathe" oxygen directly through the lens. The trial fitting system achieves a first fit success rate in over 80% of patients.
 

What is Keratoconus?
Keratoconus is a disorder of the anterior surface of the eye (the cornea). In simple terms, the cornea becomes thinner causing it to bulge from its normal round shape to a cone shape. This bulging interferes with a person's vision and can severely affect the way they see the world, making simple tasks like reading, watching TV or driving very difficult. The distortion caused by keratoconus has been compared to viewing a street sign through your car windshield during a driving rainstorm.

The progression of keratoconus is unpredictable, but generally the condition progresses slowly and can cease at any stage. While keratoconus interferes with the clarity of a person's sight it rarely causes blindness. In its early stages, keratoconus causes slight blurring and distortion of vision and increased sensitivity to glare and light. As the disorder progresses, the degree of vision obtained through glasses becomes less acceptable and contact lenses often become the best method of correcting vision problems.

 
Standard lens designs with fixed optical zones (OZ) do not ideally fit the cone shape of keratoconus patients.
Rose K Contact Lenses  Rose K Contact Lenses 
The above illustration shows a standard lens that will yield unwanted pooling at the base of the cone and peripheral bearing that can be sealed off which can cause corneal problems. 
 
The above illustration shows the benefits of a smaller optical zone to fit the cone contour. The design results in little tear pooling at the base of the cone and shows an even distribution of tears under the lens. 
 
 
 

Rose K2 Lens
With normal corneas, the shape does not change dramatically from the center 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. Usually, this will achieve reasonable alignment with the cornea and a good fit.

However, to achieve optimum alignment with the cornea in keratoconus patients, many curves are required on the back surface of the lens, and adjacent curves are often very different. Particularly in steeper cones, 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 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 control curves have been developed for computerized digital lathes to cut these very complex curves for the Rose K2 lens to give the best focus.

 
Rose K Contact Lenses  Asymmetric Corneal Technology improves lens performance for the irregular cornea patient. Rose K Contact Lenses 
 
5th Ave. Belleville St. Michael, Barbados, Phone: (246) 417-5650 Fax: (246) 436-9628
Sargeant's Village Christ Church, Barbados, Phone: (246) 417-5652 Fax: (246) 228-1937
St. Michael's Row Bridgetown, Barbados, Phone: (246) 417-5653 Fax: (246) 436-9613
The Dome Mall Warrens St. Michael, Barbados, Phone: (246) 417-5651 Fax: (246) 421-5655

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