Mississauga Optician Eye Exams On Site
Eyeglass Guide

Our Location

Vision Depot 1125 Bloor Street Mississauga ON  L4Y 2N6
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Patient Testimonial

“I dropped by Vision Depot because my eyeglass lens fell out. I was expecting to pay to have them fixed however the owner not only fixed them immediately but at no charge. Since I was in the market for new glasses I arranged an eye exam. Great service and very friendly.”

All About Prescription Lenses

What does nearsighted mean?

Nearsighted (known as myopia) is generally the result of light that is focused at a point in front of the retina.

How is it corrected?

By the use of a concave lens which causes light to diverge prior to entering the eye.

Mississauga Optician - Near sighted

What does farsighted mean?

Being farsighted (known as hyperopia) is the result of light being focused at a point beyond the retina.

How is it corrected?

It is corrected by the use of a convex lens, which causes light to converge prior to entering the eye.

Mississauga Optician Far Sighted

What is Astigmatism?

Astigmatism is usually the result of an irregularly shaped cornea causing light to be distorted or out of focus at certain angles.

How is it corrected?

Astigmatism is corrected by a special type of lens called a cylinder. Its particular curvature negates the effect of astigmatism in the eye.

What do single vision lenses do?

Single vision lenses will usually correct only for near vision or distance vision, but not both through the same prescription.

What do bifocal lenses do?

Bifocals will allow the wearer to focus both at near and far distances with only one prescription lens. Although a very helpful type of lens system, there are some limitations and a minor adaptation is required for most people.

One of the great advantages is that there is no longer a need to switch glasses when reading and /or distance viewing.

What do trifocal lenses do?

Trifocals offer near, distance and intermediate vision as well. They are most useful for distinct functions, which require sharp vision at arms length. A simple example is reading music sheets on a piano or using a computer terminal.

What do progressive multifocals do?

Commonly called invisible bifocals, these lenses offer a lot more than just an enhanced cosmetic appearance.

The prescription value increases in strength as one looks from top to bottom of the lens allowing a sharp focus from infinity to near, thus the definition “progressive”. One of the main advantages is the gradual shift in focus making the transition from distance to near a more comfortable one. Typically, line bifocals create a sharp jump in image position when crossing the segment line.

What are the most common materials used in prescription lenses?


Lenses produced from plastic resins and polymers are by far the most popular choice in eyewear today. They offer equal vision with increased comfort due to their light weight. They also allow for a greater choice of frames since plastics are available in larger size lenses than glass. Due to the delicate nature of the plastic surface, a scratch resistant coating is always a worthwhile investment.


There are two common types of glass used. One is clear glass referred to as Crown glass. The other is a photochromic glass. A chemical added to the glass when in liquid form, will cause a reaction with Ultraviolet  Rays. The reaction results in darkening the lens, thus producing a lens that is clear indoors and a sunglass outdoors. Two colors are commonly produced, grey and brown.

Ultra thin lenses

Ultra thin lenses are achieved by the combination of a denser material and a flatter surface on the front side of the lenses. This usually results in lenses, which are approximately 25% thinner and lighter in weight. Some special glass lenses can be made even more than 25% thinner; however, they are very brittle and expensive.

Ultra thins are available in both glass and plastic, single vision, line bifocals as well as invisible (or progressive) multifocals. An anti-glare coating is recommended due to their highly reflective (flatter) surfaces.

Transition lenses

Transition lenses are made of plastic and change colour when exposed to sunlight (U V rays). They are usually slightly thinner than regular plastic and come in grey or brown colours. They are also available in line bifocals and progressive lens designs.


Polycarbonate is a plastic material, which is highly resistant to impact and extremely hard to break.

Polycarbonate is lighter and thinner than regular plastic, and is often used in filling prescriptions for safety glasses required by industry. It is highly recommended for sports use, such as squash or racquetball.

Polaroid lenses

Polaroid prescription lenses are manufactured by a lamination process, where sheets of Polaroid filter are adhered to the front and back surfaces of the prescription lens. Since most reflections originate from flat surfaces, the Polaroid sheets are aligned in such a way that all horizontal light rays are virtually eliminated; thus greatly reducing glare. Polaroid offers one of the most comfortable sunglasses available today.

Coatings and Colored Tints

What is Anti-Reflection coating?

Anti reflection coatings are ideal for lens wearers sensitive to reflected light from lens surfaces. These coatings, applied to both front and back surfaces of lenses eliminate most of the surface reflection. By allowing 99.9% of the light through the lenses, they create clearer vision and improved cosmetics. About 8% of vision is lost by reflections off a normal lens surface.

Anti-Reflection lenses are also ideal for computer work to reduce stress due to screen glare. At Vision Depot we supply the best quality coatings, which are multi-layered on both sides of the lens.

What is scratch resistant coating?

This coating is very helpful in reducing most ordinary scratches on plastic lenses. It must be made clear that lenses are in no way considered to be “scratch proof”. Only minor abrasions are controlled by the use of this coating and usually the life of the lenses can be extended.

Color Tinting

Both glass and plastic can be treated so as to have a light or dark tint applied. In glass, it is a surface applied coating and in plastic, a dye is adsorbed through the pores at high temperature.

Allan Benakoun Registered Optician has over thirty years of experience in the optical field. Vision Depot is conveniently located in Mississauga Ontario at the Applewood Hills Plaza just west of Dixie Road on Bloor Street.  Call us today at (905) 276-4742.

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