Hard and RGP contact lenses
Hard lenses
Hard are made of PMMA material and they do not transmit oxygen (Dk*≈0). Today they are rarely prescribed. We manufacture hard lenses from top-quality rigid materials.
Rigid Gas Permeable (RGP) lenses
RGP lenses are proved to be the healthiest type of contact lenses. They are therefore particularly recommendable for younger people. Furthermore, they represent the best and the most advisable solution for corneal astigmatism. Numerous researches have confirmed their favorable influence on slowing the diopter power increase in miopia in young population. For more information about different types of contact lenses check our Guide to contact lenses.
Comfort RGP lens fitting tables.pdf (498 KB)
Design
In our laboratory we manufacture standard RGP lenses with peripheral curve of 3-4, Comfort lenses with peripheral curve of 9 as well as specially designed lenses (toric, keratoconus, multifocal etc.). Gas permeable lenses can be produced from materials with Dk* values ranging from 15 to 125.
| base curve radius (r) | 5.50 - 9.00 mm | in 0.01 mm steps |
| diameter (ø) | 6.50 - 11.00 mm | in 0.05 mm steps |
| sphere powers | from +35.00 to -35.00 Dsph | 0.25 Dsph/Dcyl steps |
| cylinder powers | up to 10.00 Dcyl | |
| prism | up to 3.0 Dptr of prism | 0.25 PrismD steps |
Some of our RGP contact lens trial sets
Our recommendations
ESSENTIAL® Multifocal RGP multifocal contact lenses.
- For persons over 40 with presbyopia. Especially suitable for current RGP wearers. Three series of these lenses cover all the necessary additions.
- ESSENTIAL® Multifocal represents one of the most successful multifocal lens designs in the world at the moment. These lenses embody a combination of simultaneous and translational design, which makes them less dependent on their position on the eye, changes in the size of the pupil or ability of the brain to distinguish separate pictures.
- Simple fitting
- Fast delivery – in one to two days, with a full guarantee.
Opto Centar is the only Croatian manufacturer fully registered at the Agency for medical products and medical devices. Besides the free contact lens trial sets, to all our wholesale clients we will gladly send all the documents and certificates required by their goverment’s agencies. Opto Centar is a memeber of the European Federation of the Contact Lens Industry (EFCLIN).
Materials
- 1. EuroPerm® 30
- standard material for RGP lenses with permeability of 32 Dk* and with the durability of lens up to 2.5 years.
- 2. Boston® ES
- material with lower permeability (18 Dk*), but with excellent AERCOR® structure. These characteristics make it particularly suitable for cylindric, keratoconus and presbyopic lens designs as well as ultra-thin designs, even 40% thinner than standard lenses. It is also highly recommendable for patients switching from hard lenses to RGP lenses. The durability of lens is up to 2.5 years.
- 3. Boston® EO
- this is the most frequently prescribed gas permeable material in the world at the moment. It is also extremely suitable for cylindric, keratoconus and thin lens designs which could be up to 30% thinner than the standard ones. With AERCOR® structure, the material has oxygen permeability of 58 Dk*. The durability of lens is up to 1.5 year.
- 4. Boston® XO
- with oxygen permeability of 100 Dk*, this is one of the most permeable materials in the world. Thanks to its cutting-edge F-S/A structure it retains all the best attributes of the RGP lenses with significantly lower permeability. It is particularly recommendable for younger persons, extended wear and after certain surgical procedures. Because of its high oxygen permeability, the durability of the lens is 1 year.
- 5. OPTIMUM Classic®, Comfort®, Extra® i Extreme®
- are the new gas permeable materials on the market. These unique materials are characterized by excellent wettability, superb oxygen permeability and great stability and sturdiness:
- a) OPTIMUM Classic with oxygen permeability of up to 26 Dk* can be placed in the same category as Boston ES material. In practice, it demonstrates characteristics typical for some of the more expensive groups of materials.
- b) OPTIMUM Comfort has the permeability of 65 Dk* and it is characterized by great wettability and structural stability. This material has had the highest increase in the sale throughout the world in the last year.
- c) OPTIMUM Extra with the permeability of 100 Dk* has proven excellent for daily and extended wear. Its extraordinary permeability is in perfect balance with its structure which enables the manufacture of even the most demanding lens designs.
- d) OPTIMUM Extreme with the permeability of 125 Dk* has erased all former boundaries regarding permeability and structure of material. It is ideal for the most demanding designs.
*Dk value indicates permeability of the gas permeable materials.
Boston® , Boston® ES, EO and XO are registered trademarks of Bausch & Lomb company
Optimum Classic, Comfort, Extra and Extreme are registered trademarks of Contaamac Ltd.