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Rose K2 Contact Lens

Rose K lenses are an exclusive contact lens for people with keratoconus, a degenerative eye disease that thins and deforms the cornea. The cornea, the transparent front portion of the eye, is typically spherical, but keratoconus causes it to resemble a cone. Distorted eyesight arise from this altered shape of the cornea. These lenses offer a regular and smooth surface in the keratoconus cornea,  leading to clear vision. Keratoconus is what the & “K” in Rose K stands for.

Rose K lenses are exceptional due to their optimised design for uneven corneas. This feature of the lens is possible only due to computer-guided customization and cutting. Rose K lenses are nothing but rigid gas permeable contact lenses and their precise customization makes them unique.

What are Rose K2 contact lenses?

Rose K2 lenses are customized to suit each eye because of their complex geometry. Since the lens’s back surface is highly customized it is possible to correct a higher degree of astigmatism or myopia via the lens. Also, the Rose K lens provides better eye health as it’s a type of rigid gas permeable lens.

Types of Rose K2 contact lens:

1. Rose k2 Nipple Cone: This type is mostly used for moderate and advanced nipple cones. It can also be used for any defined nipple cone in the keratoconic cornea.

• With a prominent nipple-shaped cone, keratoconic eyes are the target market for the Rose K2 NC. While the lens is probably more likely to be
• When used in mild to severe instances, it can be applied to nipple cones at any time. It won’t provide positive outcomes for bigger cones with an oval form, pellucid border either keratoglobus or degeneration.

Base Curve 4.30mm to 7.70mm total

Diameter 7.60mm to 9.00mm.

POWER Varies with the material

It has a small aspheric back optic which decreases in diameter as the base curve steepens.

2. Rose k2 Post Graft: This type is mostly used for post-operative recovery along with vision improvement. It has a multi-spherical posterior design with some reverse-curve geometry and aberration control aspheric optics across the back and front optic zone diameters.

BASE CURVE 5.30 mm to 10.0 mm

DIAMETER 9.00 mm to 12.50 mm

POWER Varies with the material

3. Rose k2 Irregular Cornea: This type is used for irregular corneas It is a larger diameter lens when compared to the above two and uses the same kind of back surface geometry design.

A special lens for special corneas is the Rose K2 IC. can fit patients with uneven corneas more easily because of the many parameters and fitting choices and the easier fitting technique.

Base Curve 5.70mm to 9.30mm.

Diameter 11.2mm

4. Rose K2 XL:
• The Rose K2 XL semi-scleral lens is the newest model in the series. Conventional or big-diameter corneal lenses are not well suited for many situations of uneven cornea. Using a semi-scleral design offers stability and enhanced comfort in situations when the wearer is not tolerant of corneal diameter lenses.

• To solve these issues and enhance the existing range, the Rose K2 XL was created. The fitting idea is the same as it is with the other Rose K family lenses. David Thomas Contact Lenses is the UK retailer of the lens.

Base Curve range: 5.60 to 8.40 mm.
Diameter range: 13.60 to 16.00 mm. (0.1 mm steps) Standard diameter: 14.60 mm.
The main indications are those irregular corneas for whom an intra-limbal design is not a suitable match. Pellucid marginal degeneration (PMD), corneal rings, post-LASIK ectasia, dry eye, and some cases of keratoconus are among the conditions. Rose K2 XL is especially beneficial when it comes to instances where better stability is needed for sports or an unfavourable work environment, or when corneal lenses are not well accepted.

5. K2 XL Oblate ROSE: 
The ROSE K2 XL Oblate is now available. Better vision and comfort will be provided to patients after photorefractive keratectomy, laser surgery (LASIK), or grafts with this latest alternative. When the tear layer thickness is too deep across the central cornea, the lens can also be utilised for any oblate corneas, including very flat corneas, that cannot be accommodated inside the limbus.The lens is made to resemble the shape of an oblate cornea and is intended for daily use.

The ROSE K2 XL Oblate fits using the same basic, tried-and-true five-step approach as all other ROSE KTM designs. The design has considerable reverse geometry in all base curves that rise as the base curve flattens, as well as an aspheric back optic zone, front surface aberration control, and accurate edge lift control. The design facilitates a more precise fit of the lens on the patient’s eye.

The lens is made to resemble the shape of an oblate cornea and is intended for daily use.

The lens has a wide parameter range and may be customised with toric peripheries, Asymmetric Corneal Technology, front, rear, and bi-toric designs, quadrant-specific edge lifts, and bifocal optics. ROSE K2 XL OblateTM, with its corneoscleral design, reduces conjunctival pressure while increasing tear exchange.

6. Rose K2 ACT: This type is used in any type of irregular cornea. It allows modifications in a specific quadrant of the lens to the practitioner which helps in achieving the best fit. Asymmetric corneal technology abbreviated as ACT is the latest design in Rose K and can be applied to any of the above designs.


Keratoconus: a condition in which the cornea gradually thins and has a cone-like form, is the main indication for Rose K lenses. Astigmatism, distortion of vision, and other disorders of the visual system might result from this uneven corneal shape.

Irregular Astigmatism: Rose K lenses are very helpful in treating irregular astigmatism, which is a condition where people with keratoconus have uneven corneal shape. A refractive defect called astigmatism causes distorted or blurry vision.

Post-Surgical Cases: Following corneal surgery, such as a corneal transplant (keratoplasty), patients may occasionally be administered Rose K lenses. After surgery, the lenses can help eyes with uneven corneal surfaces see more clearly.

Pellucid Marginal Degeneration: People with pellucid marginal degeneration, a rare disorder that thins and steepens the cornea, frequently at the margins, may also want to think about Rose K lenses.

Keratoglobus: Keratoglobus patients have thinned corneas that protrude outward in a globular pattern, weakening and irregularizing the cornea’s structure. Significant vision impairment may arise from this disorder, which may also be linked to other eye problems.

Post LASIK ectasia: A condition known as post-LASIK ectasia may develop as a side effect following laser-assisted in situ keratomileusis (LASIK) surgery. Like keratoconus, post- LASIK ectasia causes the cornea to gradually thin and enlarge.

Post Radial Keratotomy: A condition that develops after radial keratotomy surgery is termed as post-radial keratotomy. A surgical procedure named radial keratotomy was carried out to treat myopia in the 1980s and early 1990s. Following this, some patients may have difficulties with their eyesight. The changes in vision, glare, halos, and issues with night vision are some examples of these complications.

Advantages of Rose K lenses over RGP lenses:

• High level of customization
• Improved vision correction
• Specialized designs
• Better comfort
• Advanced materials
• Can correct maximum power
• Reduced glare

Disadvantage of Rose K over RGP lenses:

• Costly
• Not useful in flat corneal condition

In Rose K lenses to mimic the irregular cornea, many modifications on the back surface are required. The back surface curvatures are different on almost every point. In steeper corneas, several curvatures are required at the pupillary area to achieve perfect fitting.

The Rose K lens minimized the blurriness by modifying the lens curvature to a minor level on both the front and back surfaces of the lens. This helps in the accurate focus of the light onto the retina forming a crisp and clear image.

The Rose K2 lenses are the upgraded version of the previously available Rose K lenses. Rose K2 provides significant optical clarity due to its modified design and upgradation.