Following your eye examination, we will discuss the various frame, lens and coating options available to you.
Your choice will depend on your prescription, lifestyle and budget. At Total Vision every care is taken to ensure we help you choose the spectacles that are best suited to your individual needs.
Glass was the first material used for making spectacle lenses, it is still used today, although less commonly now, mainly due to it being much heavier than modern plastics materials and it carrying the additional risk of shattering and causing injury, although it is possible to treat the lens to increase it’s impact resistance. The main benefit of glass is that is very resistant to scratching.
In cases where very high power lenses are required, hi-index (very thin) glass lenses may still offer the best cosmetic appearance.
Plastic is the most common material used for making spectacle lenses, developed to address the two main problems with glass, it is much lighter (about half the weight of glass) and is more impact resistant. It can be hardened with a coating to make it more resistant to scratches.
Plastic lenses are also available in hi-index materials allowing the lenses to be thinner and lighter.
Polycarbonate is a very light and impact resistant material, particularly good for people who play sport or participate in activities where their spectacles may be at greater risk of damage.
Hi-Index is a term given to glass or plastic lenses. It is a denser form of the material allowing lenses to be thinner and lighter than standard glass or plastic, improving the look of your spectacles if you have a higher prescription. These lenses are always coated with an anti-reflection coating.
Anti-reflection coatings are used to further enhance the vision and appearance of your lenses, by eliminating distracting reflections and making them clearer.
Multifocal lenses are used to combine distance and near prescriptions, either for those who need 2 pairs of spectacles, or for whom having to keep removing their spectacles is not practical. This is done by using either:
- Bifocal Lenses which give clear distance vision in the top section of the lens and has a segment in the lower portion of the lens for near vision. This type of lens has two main disadvantages, they have a visible line separating the two parts of the lens and have no intermediate focus (eg when using a computer.)
- Progressive Lenses are more commonly used now. They gradually change power from the top of the lens for distance, through intermediate then to near at the very bottom of the lens. They have the advantage over bifocals of having no visible lines so are cosmetically better. Extended Focus Lenses are designed to be used for intermediate and near focus. In particular, those who use a computer and read.
Tinted Lenses are available in prescription, by permanently tinting lenses the colour of your choice, either for cosmetic purposes or with a darker, ultra-violet absorbing tint for sunglasses.
Polarized Lenses are sunglass lenses that filter out glare from horizontal surfaces, such as water, sand, the road or car bonnet, making them especially good for driving or for water sports and fishing.
Photochromic / Transitions
Photochromic / Transitions lenses change colour with the varying amounts of ultra violet and day light. They become dark, like sunglasses when outside in the day and lighten to almost clear when inside or at night. Single vision or multifocal lenses can be made in photochromic materials. Hi-Index (thinner) photochromic lenses are also available.