Frequently Asked Questions about ROSE K2 Soft

Questions from fitters regarding ROSE K2 Soft and replies by Paul Rose

last updated 2022.6.13

Q: What conditions can I fit with the Rose K2 Soft lens?

A: Most early to moderate irregular corneas including keratoconus, pellucid marginal degeneration, keratoglobus, post corneal graft, and corneal ring inserts.

• Ideal for patients new to contact lens wear or making the transition from standard soft toric lenses to specialty lenses where acceptable vision cannot be attained with a regular soft lens
• Management of those intolerant to corneal or other rigid lenses such as semi-sclerals or sclerals, as well as those for whom other lens types are not appropriate.

Q: Can I fit the lens without using a trial set from spectacle Rx and K readings or topography?

A: This is not recommended as it will result in more lenses being required to attain a successful fit so a trial set is always recommended.

Q: How do I choose my first lens?

A: You need to follow the fitting guide.

• Keratoconus and corneal inserts: Select a lens 0.80mm to 1.00mm flatter than mean Ks or mean 3mm Sim Ks.
• Corneal grafts, PMD and LASIK: Select a lens with a BC equal to the mean Ks or 3mm Sim K

Q: How often do you replace the lens?

A: 3-monthly (Silicone Hydrogel) replacement or annual or semi-annual (6 monthly hydrogel) replacement

Q: What solutions are suitable to use with Rose K2 Soft?

A: Peroxide-based solutions should always be used for storage. Soft lens surfactant cleaners are recommended routinely for surface digital cleaning after wearing. Non-preserved wetting drops can be used with the lens in situ.

Q: What material options are there?

A: 

• Definitive 74 Silicone Hydrogel: Dk: 45, Dk FATT: 60, water content 74%, blue handling tint
• Menicon Soft 72 Hydrogel: Dk: 45, Dk FATT: 60, water content 74%, aqua handling tint 

Q: What are the differences between the materials?

A: Definitive 74 being a stiffer material fits tighter than Menicon Soft 72. Therefore if using a Definitive 74 trial set and ordering the Rx lens in Menicon Soft 72 the BC should be steepened by 0.2 .

Q: Why would I choose one material over the other?

A: Silicone hydrogels deposit more easily than hydrogels. Therefore for patients who show excessive surface lens depositing Menicon Soft 72 is recommended.

Q: Can I order a thinner lens?

A: Yes. The center thickness range is 0.25 to 0.6mm. Standard 0.35mm.

Q: Can I order lenses with different parameters from the fitting set?

A: Please refer to the fitting guide. BC in 0.1 steps and a range from 6.6 to 9.4 are available. Diameter range is from 14.3mm to 15.3mm (std 14.8mm).

Q: When should I use ACT?

A: When fluting occurs at the edge of the lens – see fitting guide.

• Standard ACT (1.0) : This is where the fluting may not be apparent in the straight ahead gaze, but becomes obvious when the patient looks up, down or laterally.
• Double ACT (2.0) : Used when the fluting is always obvious, even in straight ahead gaze.

Q: Why is ACT available, but not peripheral torics,  QSEL or other asymmetrical options?

A: Because the lens tends to "wrap" around the cornea and sclera to some degree, the need for TP and QSEL is negated in by far the majority of cases. However, as thick soft lenses can lift off the cornea usually inferiorly, ACT is required on some very irregular corneas such as moderate to advanced PMD.

Q: How can I decide how much increased thickness I need in Rose K2 Soft? 

A: Do a topography over the lens in situ to make sure that there is irregular (not regular) astigmatism showing. This indicates the poorer vision may be caused by uncorrected irregular astigmatism. So how much thickness to add? There is no set answer as each case needs to be considered after analyzing the topography over the lens in situ. If the fitter does not know we suggest increasing it from the std 0.35 to 0.45 initially or asking the lab for a recommendation. The more irregularity, the thicker you need to make the lens. However, the downside is the thicker the lens the less oxygen through the lens so maximum wearing time per day may need reducing.