| Bifocal
Lenses |
|
These
lenses are designed to give good vision to
people who have a condition called presbyopia.
The key sign that you are developing presbyopia
is that you need to hold reading text further
from your eyes to see it clearly.
Bifocal contact lenses are available in both
soft (disposable or frequent replacement)
and gas permeable materials. Disposable bifocal
contact lenses first came available in 1999
and now they are also available in daily disposable.
|
How bifocal contact lenses work
They work very much like bifocal spectacles
i.e. they have two powers on one lens. One
to correct distance vision (if required),
and the other to correct near vision. Your
eye learns to differentiate the proper power
whether it’s for long or close vision.
Various designs are available i.e. simultaneous,
concentric and alternating vision. All three
designs work differently and at Opticare,
optometrists will decide on suitability |
Monovision
Bifocal lenses may not be suitable for everyone.
Because the eye needs time to
adjust to sorting out the different powers,
it takes some time to adjust to the lenses.
This amount of time varies from person to
person. This is where monovision may be recommended
as an option. With monovision, you wear one
contact lens with one power to correct distance
vision and the other contact lens with one
power to correct near vision. The distance
lens is usually worn in your dominant eye.
This may appear a little unusual, however,
most people adjust well to it and eventually
you don’t even notice that each eye
is responsible for a different part of their
vision. |
