Guide to choosing your lenses
The type of lens you choose will depend on whether you want your glasses to be a general purpose pair to suit most activities or a specific.
Single Vision Lens
Single vision lenses have the same power throughout the lens.
If you are under age 40 and need prescription glasses, then single vision lenses may be sufficient enough for your visual correction.
Multifocal Lenses- Progressive and Occupational lenses
Progressive lenses provide a gradual change in power to view all distance from near to far. If you are in your 40s or older and have presbyopia, then wearing progressive lenses has the advantage of allowing you to see all distances clearly without taking your eyeglasses on and off.
Many options (standard, advanced, tailored) are available in progressive lens design, with different levels of technology involved in the production of the lenses.
Standard: A basic general-purpose design giving you vision in all three areas; distance for driving, intermediate for computer work and near for reading.
Advanced: Newer design allowing for greater area of clear vision through the lenses compared to the standard design.
Tailored: The latest generation of lenses giving you the widest area of clear vision currently available on the market (with the least amount of distortion/ swim). These lenses are customised taking into account your prescription, frame and face and needs to be measured using a specialised computer and camera system.
Occupational lenses are usually recommended for those over 40 years of age providing enhanced office based vision (for reading and computer work). These lenses give you clear vision up close to approximately one meter away. Occupational lenses are a great option for those who spend most of the work day in front of a computer.
There are times when one pair of glasses is not enough.
These lenses have an index (density) of 1.50 and are the most commonly used material for low power prescriptions.
Polycarbonate lenses are used as safety lenses as they have a high impact resistance. These lenses have an index of 1.59 making the overall lenses thinner and lighter than standard plastic lenses.
High-Index lenses typically have an index of 1.60. High index lenses are thinner than standard plastic and are an excellent option for moderate to high prescriptions. These lenses are also suitable for rimless or semi-rimless frames.
Ultra High-Index Plastic
The index of these lenses range from 1.67 to 1.74. Ultra High-Index lenses are the thinnest and lightest materials currently available for higher power prescriptions.
Glass lenses provide excellent vision and are resistant to scratches. However, glass lenses are heavy compared to plastic lenses and are prone to breakage. It’s not recommended for children or those who are active in sports. Plastic lenses are now favoured over glass lenses due to the weight, safety and improvements in scratch resistance.
Application of coatings provides various benefits for the wearer.
Anti-reflective coatings provide you with clearer vision by reducing glare, scratches, smudges, dust and water
UV coatings protect eyes from absorbing harmful UV rays. Long term exposure can cause cumulative and irreversible damage.
Photochromatic lenses (e.g Transitions) become dark like sunglass lenses when exposed to UV light and become clear when indoors and at night.