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Contact lenses

 

Disposable

 

We stock all the major brands of soft disposable contact lenses.

 

These include daily and monthly disposable lenses, for all types of visual requirements, including:

multifocal lenses, toric lenses for astigmatism, as well as toric multifocal contact lenses, and colour contact lenses.

 

Contact lenses are divided into two primary categories, namely “soft contact lenses” and “hard contact lenses”

There are many options available and we can fit most patients with soft contact lenses, most daily and monthly replacement lenses are available to not only correct myopia or hyperopia,  but to correct for astigmatism and presbyopia (multifocal contact lenses)

Soft Contact Lenses include the following.

 

  1. Daily disposable lenses
  2. Monthly disposable lenses
  3. Extended wear disposable lenses, lenses are worn permanently for extended period of time (usually seven to fourteen days)
  4. Conventional lenses (changed at 3 months, 6 months or yearly)

 

Hard contact lens fitting or Speciality Contact Lens fitting are indicated for the following conditions.

 

Keratoconus (KC) - Keratoconus is a thinning disorder of the cornea that causes distortion and reduced vision. Keratoconus is a progressive disease that involves the thinning and steepening or "bulging" of some, but not all, of the cornea. The area affected is usually at or near the center of the cornea. About one in 2,000 people are affected by keratoconus. The disease progresses for four to seven years. Keratoconus affects both eyes in about 96% of cases, with one eye typically progressing more than the other. In keratoconus, the cornea becomes very irregular in shape and increases in astigmatism. Because of the cornea's unusual shape, eyeglasses and soft contact lenses can't fully correct vision to an acceptable level.

 

Pellucid marginal degeneration (PMD) - A condition whereby the lower cornea becomes thinner and the optic surface of the cornea becomes irregular and the vision becomes blurry.

Laser and Lasik refractive surgery may result in residual refractive error. In the event that they can not be corrected with further procedures, fitting with contact lenses may be required. These conditions special contact lens is required for fitting, Corneal ectasia is a condition where the cornea begins to protrude after being thinned too much from refractive surgery.

 

Corneal irregularity resulting from Ocular injury, disease, infection or surgery including those who have had corneal transplant surgery, radial keratotomy surgery or those with corneal scarring and irregularities from injury or corneal disease experiencing poor vision from the visual distortions

These lenses can be divided into the following types

  1. Rigid gas permeable contact lenses
  2. Piggyback contact lenses
  3. Scleral contact lenses
  4. Hybrid Contact Lenses can manage these conditions
  5. Prosthetic contact lenses

 

Reasons To Consider Contact Lenses

 

Contact lenses move with your eye, allow a natural field of view, have no frames to obstruct your vision and greatly reduce distortions.

Unlike glasses, they do not fog up or get splattered by mud or rain.

Contact lenses are excellent for sports and other physical activities.

Many people feel they look better in contact lenses.

Compared to eyeglasses, they may offer better, more natural sight.

Some Things To Remember About Contact Lenses

 

Compared with glasses, contact lenses require a longer initial examination and more follow-up visits to maintain eye health. Lens care also requires more time.

If you are going to wear your lenses successfully, you will have to clean and store them properly, adhere to lens-wearing schedules and make appointments for follow-up care.

If you are wearing disposable or planned replacement lenses, you will have to carefully follow the schedule for throwing away used lenses.

 

Specialized Contact Lenses

 

RGP Lenses are Rigid Gas Permeable lenses.

These lenses should not be confused with the old hard contact lenses, which were previously made from a material called PMMA, RGP are actually a newer technology than soft contact lenses. Most RGP materials these days incorporate silicone as to allow a greater oxygen exchange between the atmosphere and the cornea through the lens, thus enhancing greater adaption and comfort for the wearer.

 

Disadvantages of RGP Lenses

The disadvantages of wearing RGP lenses are: unlike soft lenses, to achieve maximum comfort with gas permeable contacts, you need to wear them regularly. Also, RGP lenses are much smaller in size than soft lenses, which means there is a greater risk of gas permeable lenses dislodging from the eye during sports or other activities. Require regular office visits for follow-up care

 

Advantages of RGP Lenses

The advantages of RGP lenses definately outway the disadvantages. Firstly, because RGP lenses are made from a firm plastic material, they retain their shape when you blink, which tends to provide sharper vision than soft lenses.

RGP lenses also are extremely durable, unlike soft lenses you can't tear RGP lenses.

And they're made of materials that don't contain water (as soft contact lenses do), therefore proteins and lipids from your tears do not adhere to GP lenses as readily as they do to soft lenses.

With care RGP contact lenses can last for many years. Excellent vision

 

Scleral Contact Lenses

Scleral contact lenses are a specialized type of contact lens used for managing a variety of eye conditions.   They are large diameter lenses, usually +/-18mm. because of their size, scleral lenses are more stable on the eye than conventional GP lenses so they are less likely to accidentally dislodge from the eye. The types of lenses are much larger than conventional RGP / Hard contact lenses, and even bigger than a typical soft contact lens. Scleral contact lenses are custom made for each patient. They are designed so the lens rests on the less sensitive white sclera, and vaults over the cornea. Additionally, the lenses are fit to allow no movement. These characteristics allow the lens to  be comfortable  immediately. This stability also can make them more comfortable than conventional GP lenses; scleral lenses provide initial comfort similar to soft lenses, especially for sensitive eyes or irregularly shaped corneas.

 

A Scleral lens is used when a conventional soft lens or spectacles do not offer adequate visual acuity, and in cases where a patient can no longer tolerate an RGP contact lens. The unique property of the scleral lens is that the vaulted section is filled with a fluid reservoir which acts as a liquid bandage to help treat extremely dry or diseased corneas.  Patients who suffer from dry eye, Sjogren’s syndrome, Graft Versus Host Disease (GVHD), neurotrophic keratitis and Stevens Johnson syndrome can be helped with the use of scleral contact lenses.   The fluid reservoir also masks irregularities of the cornea which can dramatically improve the vision in a patient who has diseased or traumatized eyes,  such as patients who have keratoconous or a corneal transplant.    It is not uncommon for someone who is legally blind from corneal irregularity to regain near perfect vision.

 

Piggyback lenses

Piggyback or tandem lens systems utilize a combination of rigid corneal gas permeable lenses and soft lenses. Typically we utilize a thin, highly oxygen permeable soft disposable lens with insignificant power and then fit an appropriate gas permeable rigid lens on top of the soft disposable lens. The rigid lens provides the vision correction and the soft lens provides superior comfort compared to the rigid lens being fit directly on the eye surface and also occasionally helps with centration of the rigid lens over the optics.

 

Prosthetic Contact Lenses

The Prosthetic contact lenses help to improve the aesthetics of injured, deformed, or disfigured seeing or non-seeing eyes. People who have lost eyes through accidents, disease or genetic abnormalities, as well as those already wearing prosthetic contact lenses.

 

Hybrid Contact Leneses

ClearKone® is an FDA-cleared hybrid contact lens specifically designed for the treatment of keratoconus and other corneal irregularities.  Using a revolutionary technology, ClearKone® combines the best of both worlds – the crisp vision of a high-oxygen rigid RGP contact lens with the all-day comfort and convenience of a soft lens. For some people who need contacts for astigmatism, hybrid contact lenses are the best choice. These lenses have a central zone made of a rigid gas permeable lens material, surrounded by a fitting zone made of a hydrogel or silicone hydrogel material.

 

When successfully fitted, hybrid contact lenses provide the best of both types of contact lenses for astigmatism — the sharp vision of gas permeable lenses and wearing comfort that's comparable to that of toric soft lenses. And because hybrid contact lenses are about the same size as toric soft lenses (significantly larger in diameter than gas permeable contact lenses) and have thinner edges than GP lenses, there is less risk of these lenses dislodging from the eyes during sports and other activities.Fitting hybrid contact lenses — like fitting gas permeable contacts — takes more time and expertise than fitting soft contact lenses. And, like GP contacts, these lenses are custom-made for each wearer's eyes. Hybrid contact lens fittings and lens replacements are comparable in cost with those of rigid gas permeable lenses (in other words, more expensive than soft lenses). But like GP lenses, hybrid contacts don't need to be replaced as frequently as soft contact lenses, making lens replacement costs more comparable to those of soft lenses over time.

 

Soft Contact Lenses

 

Soft Contact Lenses include the following.

  1. Daily disposable lenses
  2. Monthly disposable lenses
  3. Extended wear disposable lenses, lenses are worn permanently for extended period of time (usually seven to fourteen days)
  4. Conventional lenses (changed at 3 months, 6 months or yearly)

 

Furthermore the soft contact lens categories can be divided into

 

Single vision lenses

Spherical contact lenses have the same power in all meridians, so it doesn't matter if they rotate on your eye when you blink

 

Toric Contact Lenses

The term "toric contact lenses" usually is used to describe specially designed soft contact lenses that correct astigmatism. Most toric contacts for astigmatism are indeed soft lenses — made either of a conventional hydrogel material or a highly breathable silicone hydrogel.

 

 

Spherical contact lenses have the same power in all meridians, so it doesn't matter if they rotate on your eye when you blink. Toric lenses have different powers in different meridians, so they must remain rotationally stable and move only vertically with blinks. Some toric lenses are weighted at the bottom (below dotted line) to keep from rotating.

 

Toric soft contact lenses for astigmatism differ from regular ("spherical") soft contacts that correct only myopia or hyperopia in two important ways:

  1. Toric lenses have different powers in different meridians of the lens to correct the varying amount of nearsightedness or farsightedness in different meridians of the eye that characterizes astigmatism.
  2. Toric lenses have a design feature that enables the lens to rotate to the proper orientation on the cornea so the power meridians of the lens align with the appropriate meridians of the eye for clear vision.

 

Because every eye with astigmatism is unique, it can take more than one pair of soft toric contact lenses to find the brand and design that provides the best fit, comfort and visual acuity. Also, fitting toric contact lenses for astigmatism takes more expertise than fitting regular soft lenses. For these reasons, getting fitted with toric contact lenses typically costs more than a regular contact lens exam and fitting.

 

Also, because they have a more complex design, the cost of replacement toric contact lenses is higher than the cost of regular (spherical) soft contacts. The difference in cost will depend on the lens design, lens material, and the optical retailer you purchase them from. [Read more about contact lens costs and where to buy contact lenses.

 

Multifocal Contact Lenses

 

Multifocal contact lenses are designed to allow different lens powers that target vision at varying distances from the wearer. Multifocal contact lenses are contact lenses with multiple prescriptions all in one lens. There is typically a prescription for very close objects: one prescription for normal objects viewed at a distance, and then prescriptions for intermediate distances. This setup helps people with presbyopia correct age-related vision problems where the eye can no longer focus on objects up close.

Multifocal contact lenses are designed with a gradual transition between a prescription for close reading on one end and a prescription for normal distance viewing on the other. They are very similar to progressive eyeglasses. Bifocals, on the other hand, have a sharp edge between the near and far vision prescription areas of the lens.

There are two main types of multifocal contact lens designs. The most common is a set of concentric circles of lens powers prescribed for various viewing distances. There are also blended designs, which keep both the near and distance prescriptions close to the center of your eye, and mimic a natural viewing experience by correcting the specific points of aberration in your eyes.

Advantages to multifocals

 

Multifocals offer a range of benefits, among them:

Better visual acuity for the range of distances from near to far

A less abrupt switch between prescriptions

The ability to see in most conditions without extra eyewear

Drawbacks to multifocals

 

Multifocal contact lenses offer a lot of performance ability, but may also be:

  1. More difficult to adjust to due to a different viewing experience
  2. Accompanied by night time glare and hazy or shadowy vision during the adjustment period
  3. More expensive because of the increased complexity in design
  4. Multifocal contact lens alternatives
  5. If multifocals don’t sound like they’re a good fit, there are a number of other options, including:
  6. Pairing reading glasses with normal contact lenses
  7. Monovision contact lenses

 

 

Unit A1

Westwood

Office Park

602 Kudu St

Allensnek

Gauteng

A Discovery Health Medical Scheme
Preferred Provider