Modern optical lenses are highly engineered and can be very sophisticated. We understand that choosing the most appropriate lens to suit your needs can be a technical process, like being asked to choose the right engine for a new car. Our optometrists and optical dispensers not only have the knowledge and experience to guide you in the right direction, but will take time to explain our advice in full to ensure you are confident with your purchase. At Cooper & Lourie, we like to give you a great experience that extends beyond the time you spend with us instore.
Common Lens Types
Single vision lens have the same focal power throughout (from top to bottom) and can be used to correct myopia (short-sight), hyperopia (long-sight) and astigmatism. They are more commonly known as "distance" or "reading" glasses.
Bifocal or Trifocal lenses aid close reading and intermediate vision (vision at arm's length) by adding either one or two discrete near-focus segments, respectively, to the lower half of the lens. This extra power is required for those over 40 years of age as the eye loses its own focussing power - a condition known as "presbyopia". Unlike progressive lenses, the discrete power changes cannot give clarity to all distances and wearers often complain of some difficulties climbing stairs or walking over uneven surfaces due to the presence of an "image jump" when changing from one segment to another.
Progressive addition lenses offer a better solution to presbyopia in many instances because they offer the crispest, smoothest vision at all distances. There is no need for two pairs of glasses (one for distance and one for reading) and there are no unsightly dividing lines through the lens. Adapting to progressive multifocals can take a short period of practice but the advantage of clarity, safety and convenience make the task very worthwhile.
While eyeglasses have been around for 500 years to correct vision, they are also a fashion symbol. Selecting the frame that looks and feels just right is often the most fun part of visiting an optometrist (we know - because we love it too!). That's why Cooper & Lourie prides itself on carrying a huge selection of frames for you to try. And of course, we're always there to provide professional guidance. It's all part of our personalised service.
Modern spectacle frames can be made from a variety of different designs and materials to enhance both their aesthetic and functional characteristics to suit the needs of the wearer.
Common Frame Designs
While there are many categories of frames, a wearer will generally be asked to choose the material (either metal, plastic or a combination) and the design (either full-frame, rimless or semi-rimless).
Plastic frames are flexible. lightweight and come in any colour and pattern imaginable. They are hypo-allergenic, meaning they are less prone to react or corrode for wearers wtih acidic skin types. To increase their strength and rigidity, plastic frames are usually bulkier in appearance than metal frames.
Metal frames are more rigid and sturdy but usually heavier in weight (with the exception of titanium frames) compared to plastic frames. They are also thinner and are therefore less noticeable.
Full-frames hold the entire circumference of each lens with the frame. They have the advantage of structural integrity and are recommended for high prescriptions and wearers who are 'rougher' on their frames.
Rimless frames have lenses that are anchored to the arms by screws or special attachments. They are lighter and can give a 'no frame' appearance to the face. In some cases, wearers can also alter the shape of the lens to best suit them.
Semi-rimless frames have a portion of the frame replaced by an invisible nylon thread. This removes the 'border effect' of full frames that some wearers can find distracting.