The Contact Lens Laboratory of South Africa

Locally Manufactured RGP‘s

Info

RGP lenses have been locally manufactured in South Africa since the 1970s. Their simple designs were being made all over the world and contact lenses as we understood them were on the rise. Unfortunately, for South Africa, The United States, Europe and the Far East left us behind and began manufacturing more intricate designs where the South African optometrist was forced to either continue fitting 'old school designs' or import the previously unavailable designs from overseas. The good news is that The Contact Lens Lab of S.A has brought these lenses to the local optometrist's door by being able to manufacture these intricate designs locally through upgraded CNC machinery. Now we can deliver lenses in 2 -3 days instead of what used to take 3-4 weeks and at a fraction of the cost.




By Design

Item
Description
Recommended Material
Fitting Sets

Toric Bi Toric
Back and front surface toric design for astigmatic corneas with lenticular cyls.
Optimum comfort, Optimum extra
Toric FST
Spherical back surface RGP with added prism ballast to stabilize rotation and powers adjusted on the front surface to mask lenticular / residual cyl.
Optimum comfort, Optimum extra
Duo
The Duo Lens design is made up of a High Water Content soft lens material with a 9.5mm Indent on the front surface. The Indent of the soft lens contains a High DK RGP lens which, because of the Indent, stays centered over the pupil. It’s an ideal two lens system commonly known as ‘piggy-backing’.
Soft - High water content. RGP - Optimum extreme, Boston XO2
Duo
Bifocal / Multifocal
Concentric bifocal front surface (up to +3.00 add) on any back surface design.
Depending on back surface design
Ortho K
High dk, ortho-k, reverse curve design to help control myopia through overnight wear.
Optimum extreme, Boston XO2
Toric TBC
Back surface toric RGP designed for medium to high astigmatism.
Optimum comfort, Optimum extra
Aspheric
True e-value specific aspheric to mimic corneal curvature concentrating on corneal alignment masking more cyl than spherical RGPs and improving comfort.
Optimum extreme, Boston XO
Genesis X, Y, Z
Post Surgery
A large 12mm diameter RGP with a reverse curve to vault outside the trephined area of the cornea.
Optimum extreme, Optimum extra, Boston XO2
PCG
HD
A design that sports an aplanatic front surface to reduce aberration in high minus lenses… making a -30.00D as bright as a plano!
Depending on back surface design
Lenticular
Reduced thickness on high plus lenses to increase oxygen transmissibility through the lens using a reduced front optic zone diameter.
Depending on back surface design
Bi-Aspheric
Back and front surface aspherics provide superior comfort and reduce aberration on high minus lenses.
Optimum comfort, Optimum extra
Bi-Aspheric
Scleral
15.6, 16.7, 17.5 and 18.2mm diameter Super dk multicurve lenses for all post-op, astigmatic and irregular corneas giving superior visual acuity and comfort.
Tyro 97, Boston XO2, Optimum Extreme
SSF, SWH, SW

By Disorder

Item
Description
Recommended Material
Fitting Sets

Astigmatism Irregular
Any other shaped cornea besides a sphere or regular astigmatism
Optimum comfort
Astigmatism High
High corneal toricity of the cornea
Optimum comfort, Optimum extreme
Corneal Graft
Transplantation a.k.a keratoplasty
Tyro 97, Boston XO2, Optimum comfort, Optimum extra, Boston XO
PCG, Scleral
Post Surgery PRK
RK is a refractive surgical procedure to correct myopia (nearsightedness) that was developed in 1974, by Svyatoslav Fyodorov, a Russian ophthalmologist. Though it has been largely supplanted by newer operations, such as photorefractive keratectomy, LASIK, Epi-LASIK and the phakic intraocular lens, RK remains popular for correction of astigmatism in certain patients.
Tyro 97, Boston XO2, Optimum comfort, Optimum extra, Boston XO
PCG, Scleral
Stevens Johnson Syndrome (SJS)
Is a milder form of toxic epidermal necrolysis (TEN)
Boston XO2
Scleral 18.2 OD
Presbyopia
A condition where, with age, the eye exhibits a progressively diminished ability to focus on near objects.
Depending on back surface design
Myopia
A condition of the eye where the light that comes in does not directly focus on the retina but in front of it. This causes the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object. This condition is commonly known as near-sightedness.
Depending on back surface design
PMD
Pellucid Marginal Degeneration (PMD) is a non-inflammatory, nonhereditary cause of corneal ectasia with bilateral, clear, inferior (typically 4 o’clock to 8 o’clock), peripheral corneal thinning. 
Optimum comfort, Optimum extreme
Scleral
Keratoconus
(from Greek: kerato- horn, cornea; and konos cone) is a degenerative disorder of the eye in which structural changes within the cornea cause it to thin and change to a more conical shape than its normal gradual curve.
Optimum comfort, Optimum extra, Tyro 97, Boston XO2, Optimum extreme
Genesis Y, K5, Scleral
Aphakia
The absence of the crystalline lens of the eye, due to surgical removal, a perforating wound or ulcer, or congenital anomaly.
Keratoplasty
plastic surgery of the cornea or corneal transplantation
Tyro 97, Boston XO2, Optimum comfort, Optimum extra, Boston XO

Fitting Sets

Item
Description
PDF

Bi-Aspheric
A 45 lens fitting set with base curves ranging from 7.10 to 8.50 and 3 separate e-values per base curve (steep, regular and flat peripheral flattening). E-values on the back surface are equal to the front surface to correct aberration
e-Flo
This is the e-value specific aspheric equivalent to the spherical Multiflo
K5
the standard optic zone of the K5 is 7.0mm. After the Base Curve, the K5 has 3 intermediate curves and a 12.25mm peripheral curve
Multiflo2
The standard optic zone of the Multiflo is 8.0mm. It’s also a standard tricurve with a ‘stepped’ mid-periphery and periphery of 9.00mm and 10.50mm of radius respectively.
PCG
This set consists of 30 lenses. What’s unique here is the reverse curve. The reverse curve starts out at the optic zone of 8.2mm which usually sits outside of the ophthalmologists ‘trephined’ area of the patient’s cornea. It’s here that the ‘lift’ of the lens is produced. Essentially we’re looking to vault the operated area just enough to create a thin fluorescein layer under the lens. Most cases, unfortunately, have the ‘Mexican hat’ effect and we end up with excessive pooling. The reverse curve does a second job here by ‘pushing’ the new cornea into a new shape mimicking the base curve. We’ve also used a 12mm diameter lens to make sure we ‘purchase’ enough of the old cornea to get a stable fit. The set, as you will see in the PCG fitting set layout, has a vast base curve range as most of these cases extend to the flatter side of the spectrum.
Z
Similar to the Genesis X design where e-value specific elliptical / aspheric curves are added to the mid-periphery of the lens. The overall diameter is increased to 11.2 to help center stubborn fits.
Y
This true e-value specific aspheric set also consists of 36 lenses and again, base curves are repeated 3 times. We have chosen the steeper side of things here as is common with keratoconus corneas. The e-values are considerably larger than the X-set too. This is common on steeper curvatures. You will also notice in the attachment that we have jumped the base curves in steps of 0.20mm. This has been done to keep the cost of the set down and the amount of lenses in one set down too. We do, however, have a “B” set that still has a 0.20mm increments but in the ‘odd’ numbers ie. 6.50mm, 6.70mm, 6.90mm, etc. We feel that it’s up to the practitioner to make their own decisions as to what increments they need. I personally believe that base curves with increments of 0.10mm are ‘overkill’ for keratoconics.
SWH RG
It is essential to remember that there is never only just one visual solution for a patient in your chair. Some patients will present with a need for more than just one solution. There can thus be alternation between a normal corneal lens and a scleral lens or even between a pairing of scleral lenses together with spectacles. The key is therefore to keep an open mind and to think outside the box.
SSF
The 2-Spec SSF 15.6mm scleral lens design offers two unique characteristics built into one concept. Bearing on the sclera and completely vaulting the cornea to achieve best visual acuity and comfort for the patient.