Contact Lenses

New developments in relation to contact lens technology have allowed many more people to experience and see the benefits that contact lenses can provide.

We can now provide an excellent contact lens alternative for nearly any prescription, depending upon your requirements we can fit extended wear lenses (up to 30 nights continuous wear) daily disposables, toric lenses to correct astigmatism and multifocal lenses.

Michael also has experience in fitting rigid (hard) and scleral lenses for difficult prescriptions in cases such as kerataconus and post corneal graft as well as orthokeratology (overnight myopia control).

Michael is also one of a few select practitioners to have access to the new Duette hybrid range of lenses that are giving a fantastic alternative to any sort of prescription including multifocals.

In any case Michael or Pat  will be happy to discuss the alternatives with you during your consultation.

About Contact lenses

Contact lenses are small pieces of complex plastic that are placed directly over the cornea and can correct myopia, hyperopia, presbyopia and astigmatism.

Contact lens wear schedules include daily wear, designed to be worn during the day and taken out at night, or extended wear, which can be worn overnight.

Depending on their replacement schedule and lens type, contact lenses fall into several categories:

  1. Conventional soft (Hydrophilic) lenses
  2. Gas permeable (rigid) contact lenses
  3. Disposable lenses
  4. Extended wear lenses
  5. Hybrid  lenses
  6. Ortho-k lenses
  7. Special purpose lenses

Conventional soft contact lenses

Soft contact lenses are made specifically to the patient’s prescription. Not all patients can wear disposable lenses and there may be other reasons why a conventional soft contact lens is prescribed. The life of a conventional soft lens is typically one-to-three years.

Gas permeable (rigid) contact lenses

Gas permeable (GP) contact lenses allow more oxygen to transmit into the eye than soft contact lenses. While GP lenses are not as flexible as soft lenses, they contain silicone, which gives them a greater flexibility and significantly more oxygen permeability than traditional hard lenses.

GP lenses take a little longer to adapt to, but provide sharper vision correction and are more appropriate than soft lenses for people with conditions such as astigmatism.  They are also necessary for specific conditions such as the correction of keratoconus or other irregularities of the cornea.

Disposable soft contact lenses

Disposable contact lenses are designed to be worn during the day and replaced on a regular basis, whether daily, weekly or monthly. The replacement schedule of disposable contact lenses depends upon the prescription and the type of material from which the lens is made.

Frequent replacement of contact lenses provides greater comfort and reduced risk of infection from the build-up of protein, calcium and lipids that occur naturally in the eye.

Extended wear (or leave-in) contact lenses

Extended wear contact lenses are usually soft contact lenses which allow more oxygen to reach your cornea. Depending on the type of lens, extended wear contact lenses can be worn without removal for seven-to-30 days.

Extended wear contact lenses are not re-usable, thereby reducing the risk of infection that occurs with lens cleaning and reuse.

Hybrid  contact lenses

Combination lenses consist of a rigid centre lens with a surrounding soft skirt. They are normally used in specialist practices mainly for medical purposes such as distorted or damaged corneas.

Ortho-k contact lenses

Ortho-keratology lenses are used to correct the vision  by wearing a rigid gas permeable lens overnight. Each lens is designed specifically for an individual cornea and utilises the fluid layer trapped between the lens and eye to remodel the corneal shape.

The lens is removed on waking and gives clear vision over that day, sometimes longer. There is also early evidence that this procedure may slow down the progression of myopia in teenagers. Not all contact lens practitioners do ortho-k work and you should discuss the pros and cons of this with your own practitioner.

For more information on ortho-k lenses see our ortho k page.

Other specialist contact lenses

Many other specialist lenses are available that may be used in more unusual or difficult cases. Speak to your optometrist for assistance.