Monofocal IOLs provide patients with a set focal point, usually for distance vision. The most common type of lens used with cataract and lens surgery is called a monofocal IOL. It has one focusing distance. Most people have them set for clear distance vision. Then they wear eyeglasses for reading or close work.
Trifocal/Multifocal IOLs provide patients with multiple focal points by dividing the light and focusing it on more than one point, providing a greater range of sight. Multifocal lenses can further reduce the need for glasses or contact lenses after surgery in some cases because they provide both distance and near focus at the same time. The lens has different zones set at different powers within the same lens.
EDOFs IOLs (Extended Depth-Of-Focus) are a new lens technology in the treatment of presbyopia (aging lens). In contrast to multifocal (MF) IOLs, EDOF lenses create a single elongated focal point, rather than several foci, to enhance depth of focus.
Toric IOLs is suitable for people with astigmatism. Astigmatism is a refractive error caused by an uneven curve in your cornea or lens. The Toric lens is designed to correct that that unevenness and is inserted in the same axis to that of the eye.
Piggyback lenses are used when a patient is considered to have very high prescription error. Every patient’s eyes are different, and every eye will heal differently. In some rare cases, minor adjustments are required after an intraocular lens implant. The Piggyback lenses are enhancement lenses which work with other intraocular lenses. They can be safely and effectively added to your original lens implant, which means patients avoid the unnecessary discomfort and inconvenience of having the original intraocular lens removed. Piggyback lenses are exceptionally thin and are custom matched for your eyes.
Small Aperture Lens – IC-8 IOL. The IC-8 lens takes a clear artificial lens and adds a small mini-ring in the centre. This mini ring creates a pinhole effect, which extends your natural range of vision (near to far) by funnelling light through the centre of the ring so that only focused light rays enter your eye. This advanced technology is designed to
• Bring back your everyday vision
• Provide excellent far vision + computer and reading vision
Glare and Haloes
Initially the new implants may cause some glare and haloes. Please avoid searching
for haloes. When driving at night refrain from looking at the oncoming headlights. It is
better not to drive in the lane closest to opposing traffic. Though the taillights in the
cars in front may appear bigger, don’t stare at them. These side effects decrease as
the eye heals and astigmatism and spherical imperfections are treated. They
disappear in a few months as the brain adapts and subtracts the aberrations in the
images. Hardly anyone notices them in a year from the procedure.
The below image of the photopic phenomena that may occur in different severity in different types of IOLs. The phenomena are glare and halos in night vision.
