About your Vision
Vision Problems - Care and Treatment
There is a range of problems that can occur with sight. Some of these require the use of glasses or contact lenses, others require different forms of treatments. We focus on advanced eye care. We explain some of the common problems with sight; including Presbyopia, Long and Short-sightedness, Astigmatism and Cataracts.
In order to understand your options, it is crucial to understand how our visual system works. Light enters the eye through the transparent front window, the Cornea. It is a static or fixed lens that contributes to two-thirds of the focusing of the eye. The light then passes through the crystalline lens. In a youthful state, it can change shape and adjust the focusing in the eye. It enables a seamless transition from near to distance vision.
After passing through the lens, the light is focused on the retina. Analogous to the film, rather like the electrical sensor at the back of a camera, the retina converts the light energy to electrical energy. It is then transmitted along the optic nerve to the brain. This energy, in turn, interprets the signal enabling us to visualize the world around us.
Myopia, or short-sightedness, describes the condition when objects close to us appear in focus. However, objects in the distance are blurred.
In high myopia, glasses are required to read or help with intermediate vision such as using a computer screen as the eyes optimal focus is set to within a few centimetres of the eyes.
Eyes that are short-sighted are generally longer than normal. This means that the light is focused in front of, rather than at the retina. Contact lenses/glasses that diverge or separate light rays before they enter the eye are required to correct your sight.
When performing lens replacement or cataract surgery, an intraocular lens, that is a lens placed inside the eye, can be selected. It corrects the eyes’ natural defocus error. Lenses can be made to cover a very large range of short-sightedness; from as low as -0.5 all the way up to -30 and beyond. This kind of advanced eye care enables you to enjoy good vision with minimal dependence on glasses.
Single focus and multifocal lenses are available to correct near-sightedness. If your eyes are suitable, multifocal lenses may allow you to continue your daily activities without the need for glasses.
In Hyperopia (or farsightedness), the eye has a better ability to see distant objects than the objects that are close. Lenses that help converge or that bring the light rays closer together are required.
Eyes that are far-sighted are generally smaller than normal. This means that the light is focused behind, rather than at the retina. Contact lenses/glasses that converge or bring light rays closer together before they enter the eye are required to correct your sight.
When performing lens replacement or cataract surgery, an intraocular lens, that is a lens placed inside the eye, can be selected. It corrects the eyes natural defocus error. Lenses can be made to cover a very large range of far-sightedness; from as low as +0.5 all the way up to +30 and beyond. This kind of advanced eye care could enable you to enjoy good vision with minimal dependence on glasses.
Single focus and multifocal lenses are available to correct far-sightedness. If your eyes are suitable, multifocal lenses may allow you to carry out your daily activities without the need for glasses.
In Astigmatism, the light entering the eye, rather than being focused at a single point, is focused at multiple different points. This causes distorted or blurred vision. Objects appear bent as well as being out of focus.
Astigmatism can take a number of different forms. However, the most common cause is an unequal curve of the main lens of the eye, the cornea. If the cornea is steeper in one direction compared to the other, an ’Astigmatic’ focus will be caused.
When performing lens replacement or cataract surgery; an intraocular lens that is a lens placed inside the eye can be selected that corrects the corneal curvature. Specialised scanning of your eye is performed for your vision care. After that, a toric lens can be chosen to correct the specific astigmatism of your eye. Toric lenses are available for single focus as well as multifocal lenses. If your eyes are suitable, multifocal lenses may allow you to carry out your daily activities without the need for glasses.
Presbyopia is an age-related condition. As you get older, the lens in the eyes gradually loses their ability to change shape. They do not adjust the focusing power of the eye.
Most people begin to experience this in their forties. Initially, they adjust by holding objects further away to have them in focus. With time, glasses become increasingly necessary to read or use a computer. Presbyopia gets worse with time. You may find yourself having to increase the strength of your reading glasses to compensate.
However, there is good news that allows you to experience advanced eye care. The latest developments in lens design may give you the opportunity to recover this natural deterioration in your sight. It can allow you to virtually dispose of your glasses.
Increasingly, people are opting to have lens surgery before they develop cataracts. This eye lens operation allows them to correct for the loss of reading vision. At the same time, they opt for the correction of glasses they need for distance vision by having multifocal lens implants.
Monovision is a way of helping patients with presbyopia to do routine, near-sighted tasks without reading glasses. The dominant eye is set for distance vision, and the non-dominant eye is set for reading vision.
The two eyes still work together as a team so that you can see clearly at all distances; it’s just that one eye sees more clearly than the other at a certain distance.
Though Monovision might sound difficult to adjust to, most people adapt to it easily. They don’t even notice which eye is their “distance eye” and which is “near eye” when both eyes are open.
Prior to any surgical Monovision correction, a contact lens trial will be required. You should know within one to two hours if you are likely to adapt to monovision. Thereafter, you should wear your lenses for one to two weeks. It will help determine whether or not your visual requirements have been met for advanced vision care.