Author: truvalu

WHAT ARE HIGH INDEX LENSES?

Eyeglass lenses come in varying indexes from regular to high index lenses. The most common is 1.5 index which is suitable for weaker prescriptions. For stronger prescriptions, 1.5 index lenses can be used. However, in order to make the appropriate correction, the lenses need to be much thicker.

Lenses for high reading prescriptions tend to have a greater centre thickness. From an observers perspective, the lens magnifies the eyes making them look much larger. Lenses with a strong distance prescription have a thicker lens edge. These lenses have the opposite effect of minifying the eyes. The result in both cases is also a much heavier lens.

High index lenses bend the light more efficiently compared to regular index lenses. This makes them a more suitable choice for stronger prescriptions. High index lenses are available in a 1.56, 1.6, 1.67 and 1.74 index. Your Eye Care Professional will determine which index is most suitable for your prescription needs to ensure you have the thinnest and most lightweight lens option.

Although high index lenses are more expensive, the lighter weight of these lenses will ensure a more comfortable fit when you wear your glasses. The thinner lens is also more aesthetically pleasing.

High index lenses can be used for single vision, bifocal and progressive lenses. They can also be combined with various coatings. Anti-reflective coatings are a must with high-index lenses as they eliminate glare. Other options include blue-light blocking, transition and polarized sunglass lenses.

PRESBYOPIA AND PROGRESSIVE LENSES

Presbyopia Symptoms and Progressive Lenses

Do you find that your arms are not long enough to read the newspaper? If you are over 40 years of age and find yourself having to hold your reading material further and further away from you, it’s likely time for progressive/multifocal lenses.

Presbyopia is a common eye condition that is usually experienced in the form of blurred near vision when reading, sewing or working at the computer. This may result in the development of headaches, eye strain or tired eyes when performing near work.

Presbyopia is caused by age-related factors which cause a loss of flexibility of the natural lens of the eye making the lens harder and less elastic over time.  This condition is easily corrected with eyeglasses of increasing strength as a person ages.

Corrective lens options include reading glasses, bifocals or multi-focal/progressive addition lenses. Where reading glasses are usually worn only while doing close work, bifocals add two points of focus, with the upper portion of the lens allowing for distance vision and and a lower segment providing a different lens power to allow for close work.

Progressive lenses/multifocal lenses allow a more gradual vision transition between the distance and reading prescriptions by adding an intermediate area between the two . Unlike with a bifocal or trifocal lens, there is no line.  From the movie screen to the restaurant menu, progressive lenses offer convenience as they eliminate the need for two separate pairs of glasses.

Progressive Lenses are available in high Index lens options. Additional coatings that are recommended for progressive lenses are anti-reflective /no glare coatings. You may also want to consider Transitions for your progressive lens which darken spontaneously outdoors and also provide protection from harmful UVA and UVB rays.

Your lens choice and coatings largely depend on your personal prescription and lifestyle needs so talk to your Eye Care Professional to find your optimal lens solution today.

 

 

SUNGLASS LENS OPTIONS

When shopping for sunglasses your first thoughts are on the frame. What do you like?  Metal… plastic… wrap-around…aviator. The frame styles are endless but you also want to choose a frame that is larger to provide maximum coverage of the eyes.

Once you have found the perfect frame, the next decision lies in the type of sunglass lens you choose. Your selection will depend largely on your lifestyle needs.

A tinted lens will reduce transmission of light into the eye and an additional UV filter will protect the eyes from harmful UV rays. The amount of transmission of light through the lens depends on the tint. The darker the tint, the less light can pass through the lens. For example, a darker tint may provide a good solution for skiers who are in very bright conditions. These characteristics of tint and UV filter are essential for a sunglass lens.

Anti-reflective coating is also a good option to consider because it eliminates glare from sunlight that reflects into the eye from the back surface of the lens when the sun is behind you.

Polarized sunglass lenses are an ideal solution for people who spend a lot of time outdoors. Boaters, golfers, skiers and joggers can all benefit from the glare reducing effects of polarized lenses. They are also a good option for driving as they reduce glare from the hood of the car and surface of the road.

When light is reflected from surfaces such as the road or water, the light is generally reflected in a horizontal direction. This light can be very intense and is what the eye experiences as glare. Polarized lenses contain a special filter that is able to block these very intense reflected rays so reducing glare. They provide better comfort for the eyes and enable you to see better in such conditions.

 

All of the options mentioned can be applied to single vision, bifocal or progressive lenses. Distance sunglass lenses are great for correcting your distance vision and sunglasses with a reading prescription will allow you to enjoy your book outdoors with comfort and protection from the sun. Progressive sunglasses are an all round solution that will allow you to hit your golf ball and then read the menu as you sit down to enjoy your lunch afterwards!

 

Talk to your Eye Care Professional for the lens option that best suits your needs and enjoy the sun with the comfort and protection your eyes need.