What is an Anti-Reflection Coating?

Anti-reflective or anti-reflex (AR) coatings are a type of optical coating applied to the surface of lenses to reduce reflections.

Optometrists dispense anti-reflex lenses because the decreased reflection makes them look cosmetically better, and they produce less glare, which is particularly noticeable when driving at night or working in front of a computer monitor.

The decreased glare means that wearers often find their eyes are less tired, particularly at the end of the day. Allowing more light to pass through the lens also increases contrast and therefore increases visual acuity.

What are Transitions?

Transition or photochromic lenses are lenses that darken on exposure to UV radiation. Once the UV is removed (for example by walking indoors), the lenses will gradually return to their clear state.

Typically, photochromic lenses darken substantially in response to UV light in less than one minute, and then continue to darken very slightly over the next fifteen minutes. The lenses fade back to clear along a similar pattern.

What is Phoenix?

A relatively new material, Phoenix lenses are the lightest choice available and come with built-in ultra-violet protection. They are also the best lenses for prescription sunglasses, as they accept the tinting process with the sharpest visual results.

Phoenix lenses are impact-resistant, but they are not yet certified for safety eyewear. They are the most versatile lightweight choice for all prescriptions and lifestyles and are suitable for any lens coatings or treatments — especially tinting.

This is the best lens for people who desire lightweight eyewear. They are also the best lens choice for rimless and drill-mounted eyewear styles as they will not chip or crack at the drilled points.

What is Polarized?

Polarized lenses are made from a special polarizing film that is applied in the factory on the front surface of the lens. This film allows light rays to be filtered, consequently improving the vision in strong light conditions and eliminating glare.

Polarized lenses can be used for driving and in fact can reduce the glare that comes off a long, flat surface such as the hood of the car or the surface of a road.

Polarized lenses can also be used indoors by light-sensitive people such as post-cataract surgery patients or by those exposed to bright light through windows.

What is Hi-Index?

Hi-Index lenses are made from higher-density materials than standard plastic lenses and consequently bend light more than conventional lens materials. This means that they are both thinner and lighter.

Hi-Index lenses provide significant advantages over traditional plastic or glass. They are made of a denser resin material that makes high nearsighted prescriptions thinner, flatter, and lighter. This eliminates the thick “coke bottle” effect of high nearsighted prescriptions and the “bug eye” effect of high farsighted prescriptions.

The process also improves peripheral vision, filters out UV light (both UVA and UVB), and makes the lenses more cosmetically appealing.

What is UV Coating?

Another lens treatment that is beneficial but invisible to the naked eye is ultraviolet (UV) protection.

Just as we use sunscreen to keep the sun’s UV rays from harming our skin, UV treatment in spectacle lenses blocks those same rays from damaging our eyes.

Overexposure to ultraviolet light is thought to be a cause of cataracts, retinal damage and other eye problems.

An ultraviolet (UV) coating is simple and quick to apply, and it does not change the appearance of the lenses at all.

What is a Lens Tint?

Tints can be added to spectacle lenses of all types to provide sun and ultraviolet protection.

Tints are a great way to make a fashion statement, add comfort for bright light situations or long-distance driving, or reduce glare from computer screens, high-gloss paper, and fluorescent lights. They’re easy, affordable, can be applied to virtually any lens, and come in a wide range of colors and degrees of shading.

For protection from bright outdoor light If you frequently switch from indoors to outdoors, you may want to consider photochromic or Transitions lenses, which change from clear inside to dark outdoors automatically.

How to Interpret Your Prescription.

Sphere (SPH).

The term “sphere” means that the correction for nearsightedness or farsightedness is “spherical,”

This indicates the lens power, measured in diopters.

A minus sign (–), indicates you are Myopic (nearsighted).

A plus sign (+), indicates you are Hyperopic ( farsighted).

Cylinder (CYL).

The term “cylinder” means that this lens power added to correct astigmatism.

This indicates the amount of lens power to correct the astigmatism. If nothing appears in this column, you have little or no astigmatism that requires correction.

The number in the cylinder column may be preceded with a minus sign.

Cylinder power always follows the sphere power in a prescription.

Axis.

This describes the lens meridian that contains no cylinder power to correct astigmatism. The axis is defined with a number from 1 to 180. The Axis is preceded by an “x” when written freehand.

Meridians of the eye are determined by superimposing a protractor scale on the eye’s front surface.

Add.

This is the added magnifying power applied to the bottom part of Bifocal lens to correct Presbyopia.

The number appearing in this section of the prescription is always a “plus” power, even if it is not preceded by a plus sign.

Generally, it will range from +0.75 to +3.00 D and is usually the same power for each eye.

PD – Pupillary Distance

This is the measurement from the centre of the pupil of your one eye to the centre of the pupil of your other eye.

This measurement is needed for the centration of your prescription lenses .

This is also used on out Virtual Mirror to ensure the sizing of the frames/ sunglasses are correctly sized in relation to your face size.