When deciding what style and size of glasses to order, there are several things to consider that will affect the size of the lens as well as the appearance of the finished spectacles.

If you are very short-sighted, the lens will become thicker as it progresses out from the centre of the lens or glasses frame towards the edge. Things to consider therefore are :

• Try and select a frame that fits in proportion with your face – but with a small(er) lens where possible. This will tend to make the lens and hence the glasses thinner and lighter.
• If possible, use a high index material for your lens selection. Standard lenses are 1.5 or so – if your prescription is quite acute, moving to (more expensive !) high index lenses can have a substantial impact on the thickness and so the weight of the lens and spectacles. The delta from standard lenses to 1.74 lenses can be as much as 45%.
• Get glasses lenses with an anti-reflective (AR) coating. Eliminating lens reflections will make your lenses look thinner, and provide better vision when driving at night.

If you are very farsighted:

• Choose a smaller frame. A frame with a smaller lens area will reduce the thickness of your lenses and the overall weight of your eyewear.
• Choose an “aspheric” lens. An aspheric lens design will make your lenses flatter and reduce unwanted magnification that can give you that “bug-eye” look with regular lenses with a high prescription for long sight. Aspheric lenses also provide better peripheral vision if you are farsighted.
• Avoid rimless frame designs. Lenses for longsight sometimes have to be made thicker to fit in this type of frame.

If in doubt, call us on 0151 632 6611

or visit our website for helpful information :  www.Spex4Less.com

Tags: aspheric, buy glasses online, longsight, shortsight

This entry was posted on Thursday, May 28th, 2009 at 8:25 pm and is filed under Glasses, Lenses. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.