Glasses can get complicated! There are many different choices when it comes to lenses based on different needs. Our suggestions will be tailored to each individual based on the visual demands each patient has.

What is a Single Vision Lens?

Theses lenses are set for a specific distance. In many people the prescription for distance, computer and reading is the same prescription. Some people have different prescriptions for distance and a separate one for reading, but with all single vision lenses if you look anywhere in the lens for the distance that the lenses are made for you should see clearly.

What is a Progressive Lens (Invisible Bifocal or Trifocal)?

This is Bifocal that does everything, it is a smooth transition from the distance prescription in the top to the reading prescription in the bottom. It has no lines and looks like a regular pair of glasses. This is the most popular lens for patients that have a distance and reading prescription. It provides convenience and looks great too! People sometimes find it frustrating to get used to progressive lenses but this adaptation period usually takes about one week to adapt to. The reason they are difficult to adapt to is the blending area off to either side. Blending the prescriptions creates areas of distortion that are unusable. Not all progressives are created equal and the higher end lenses aim to reduce this area of distortion. Picking the right progressive will certainly increase your chances of adaptation success. Our optician or optometrist will select a lens for you but if you have any specific requests we’d be happy to discuss them!

Progressive Lenses

Tips for Getting Comfortable with your New Progressive Lenses
  • Follow your nose: point your nose at whatever you’re trying to look at. This will ensure that your looking through the right section of your lens.
  • Computer positioning: make sure your computer is an arms length away and 10 degrees down from where you are sitting. This will ensure that you are looking through the computer portion of your new progressive lenses.
  • Don’t switch back and forth: switching back and forth between old glasses and your new progressives will prolong the adaptation period. Try to continuously wear your progressive lenses.
  • Eyeglass positioning: make sure you aren’t wearing your frames too low on your nose. This will make the reading area seem very small. Wear them as close to your eyes as you can.

If adjusting to your new progressive lenses is happening very slowly feel free to come into the office and have the glasses re-adjusted and checked. We’d be more than happy to fine tune the lens to suit all your needs.

What is a Bifocal?

A bifocal is a lens that has two prescriptions; a distance prescription in the top and a reading prescription in the bottom. The prescription in the top portion of the lens is for far away and the prescription in the bottom section is set for 40 cm. Anywhere you look in the top portion should be good for far away and anywhere you look in the reading segment should be ideal for 40cm. The drawback to these lenses is that people can see where the reading segment starts, and there is no prescription for the intermediate distance. The intermediate distance is typically at arms length and this is typically the section people will use when looking at the computer.


What is a Trifocal?

A trifocal has three different prescriptions. The top is for the distance, the middle is for the intermediate distance and the bottom is for the reading. Just like in a line bifocal anywhere you look in each segment should be clear for the distance at which it is prescribed for. However, people can see the lines in these lenses too.


Computer Progressive Lenses

This is a great task specific lens. This is similar to a progressive lens in that there are different sections for different distances and that there is no line. However, with these lenses the computer prescription is in the straight ahead position of the lens, right where you need it to be. The reading section is in the bottom. This lens is perfect for people on the computer for a long period of time. It works better than a progressive because the computer section is wide and in the straight ahead position. With a progressive it is much narrower and slightly below the center of the lens. As well, the reading section is much larger. The drawback is that this lens is not for driving or walking around. This lens are helpful with symptoms of headache, eye strain, and neck pain.

Computer Progressive


Scratch Coating

This is a coating applied to the surface of a lens to help prevent scratches to the lens surface. All of our lenses come with a scratch coating no need to add it on. These coatings make the lenses scratch resistant but unfortunately not scratch proof. Some tips to prevent scratching your lenses are:

  • Cleaning materials: make sure you use a soft cloth to clean your glasses, microfiber cloths are the best, and be sure to either use a lens cleaner or some diluted dish soap and warm water.
  • Use two hands to remove glasses: this avoids dropping the glasses which can easily scratch or damage the lens surface
  • Storage: using a case is a great way to reduce the chances of scratching your lenses. As well, if you are setting your glasses down never have the lens surface against the surface you are setting them on.

Anti-glare Coating

This is a coating applied to the surface of the lens. It reduces the amount of glare off the back and front surface of the lens by a property known as destructive interference. This accomplishes two goals. The first to reduce the amount of glare off the front surface of the lens so when people are looking at you they see through your lens and not reflections off the front surface of the lens, and the result is a more aesthetically pleasing lens. The second function is to reduce glare coming off the back surface of the lens and into your eye, and this reduces the amount of glare someone see’s. Anti-glare coatings are a great way to see less glare and look better in your glasses but it can make it tougher to keep fingerprints off your lenses and that’s why we don’t routinely recommend for children but certainly for adults it is a real advantage to have this coating.