See better. Look perfect.

Lenses for Presbyopia

The tiny lens inside the human eye changes its shape to let us see clearly at different distances.

As we get older, the lens begins to lose its flexibility, which makes it increasingly more difficult and tiring for us to change our focus and to see close objects clearly.

The difficulty in focusing when reading, sewing and performing other close tasks are affected, becomes noticeable around the ages of 40 – 45 years.

This condition is called presbyopia. It can be corrected by glasses lenses that restore our power to see at near range.

Reading glasses are prescribed to help people see close up.

These spectacles cannot be used to see in the distance, so the wearer will continually find it necessary to remove the reading glasses when looking at people, when talking to them, when watching television, or looking across the room or street.

While driving, it is necessary to constantly scan the road and the instrument panel and a single vision lens will not permit this.

Multifocal Lenses

Multifocal lenses enable the wearer to focus on both near and distance and, depending on the lens type, on middle distances, without removing his or her glasses.

There are three main kinds of multi-focal lenses: progressive, bifocal and trifocal.

Progressive Lenses

The most popular choice of correction of presbyopia is a progressive lense, or varifocals as they are also called.

With a progressive lens, the power changes gradually from distance correction through the intermediate powers to the reading prescription.

Unlike bifocal or trifocal lenses, progressive lenses do not have definite dividing lines between the different portions of the lens as they merge into each other. Instead of distinct segments, there is a gentle change from distant to intermediate to near focus part of the lens.

The wearer has an infinite number of focusing distances, the nearest one can get to having natural sight with prescription spectacles. All distances look sharp and clear.

Most people think that progressive lenses look better than bifocals or trifocals because, like ordinary single vision lenses, there are no obvious lines across the lenses.  Some people are reluctant to wear multifocal lenses because they associate them with older people.

Progressive lenses offer them the best of both worlds: the benefits of multifocals and a young appearance.

Another advantage of progressive lenses is that because there is no sharp line dividing portions of the lens, there is no obstruction to vision through image jump, which makes it safer to use stairs and escalators.

Generally, people find that adapting to progressive is fast and easy. Some people are aware of distortion at the sides of the lenses when first wearing progressives but adapt readily, as with any new pair of glasses.

Bifocal Lenses

There are two distinct areas to a bifocal lens.

In most cases, the top portion is used for distance viewing and the lower portion for reading and other close work such as sewing.

The lower portion may be semi-circular, D shaped, a narrow band, or simply divided from the upper portion by a straight line.

One of our qualified optical dispensers at Ian Donald Optometrist can help you choose the kind of bifocal that will best suit your requirements.

If glasses are already worn for distance vision, the onset of presbyopia means you will either need a second pair of glasses for reading range or bifocal lenses, incorporating prescriptions for both distance and near ranges.

For people who need near range correction only, bifocals are still an excellent alternative to single vision lenses because they will avoid the inconvenience of removing the glasses for distance vision.

Trifocal Lenses

It is important for some people to be able to focus clearly at mid range between distance and near.

For example, musicians may need to see their instruments up close, and read music at arm’s length while still being able to see the conductor in the distance.

Someone with these needs will require trifocals, which give clear vision at three distances: for distance, middle distance, and near.

There are three portions to a trifocal lens.

The top, which is usually the largest portion, is for distance, the middle section is for seeing at intermediate distances, such as arm’s length; and the lowest part is for reading and other close work.

The dividing lines between the three portions may be curved or straight, just as with bifocals.

Trifocal lenses have these portions in different positions to cater for particular needs.

One of our qualified optical dispensers at Ian Donald Optometrist can help you choose the kind of trifocal that will best suit your requirements.

Crizal Prevencia

If you’re reading this on your smart phone, tablet or computer, you’re more than likely to be affected by the blue light coming from your LCD screen. The light from digital screens assaults our eyes. Overexposure can cause visual fatigue, headaches and insomnia. Our day to day electronics are taking a toll on our eyes, and causing excessive eye strain that can be avoided with our Crizal Prevencia lenses.

Crizal Prevencia comes with many advantages, the most important being the filtering of potentially harmful blue-violet light and UV rays.

The muscles that control your eyes are the fastest and most active of all, contracting 1/100 of a second. So it’s no wonder they get tired.

Reduce eye muscle fatigue with these three steps.

  1. Look away from your computer at least every 20 minutes and gaze at a distant object for at least 20 seconds.
  2. Get the right amount of sleep.
  3. Make sure your glasses have Crizal Prevencia with blue light protection (easy as that!).

CONTACT IAN DONALD OPTOMETRIST

Pin Shop 2
37 -39 The Corso
Manly
02 9977 6700 02 9977 3402

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