by Jamie Bartlett 2 min read

Plano lenses are simply an optical lens which provide no corrective power.

You’ll know if you require plano lenses if you see the term “plano”, “PL” or “0.00” in your Sphere box on your prescription paper. Instead of leaving this initial box blank, it’s common practice for your optometrist to confirm that you require no dioptric correction in that eye.

For example;

Right eye | SPH: PL | CYL: 0.00 | AXIS: 000

Need help understanding your prescription? Click here.

 

What does plano mean?

Now you think of it, plano is a strange sounding word.

But it derives from the Latin word “planus” for flat or level. In the context of optical lenses, a planoconvex lens refers to a lens which is flat and provides no dioptric power.

 

What are demo lenses?

For demonstrative purposes in retail or home-trial scenarios, spectacle frames are fitted with what are called demo lenses.

This is done to simulate corrective lenses, simply to give you an idea of what the frame will look like in a more realistic aesthetic.

Despite providing no corrective power, demo lenses are not the same as plano lenses. For display purposes only, demo lenses are cheaply made from thin acrylic and don’t provide any UV or blue light protection for your eyes.

If you prescription requires you to use a plano lens, your glasses will always be fitted with matching quality of lens such as CR39 or polycarbonate. This means your lenses will look and perform the same if you choose to have any additional coatings such as anti-glare, anti-scratch and/or blue light blocking.

 

Rows of glasses in optician fitted with demo lenses

Demo lenses are only used for retail purposes to simulate real lenses.

 

Reasons to use plano lenses

More often than not, one of your eyes will be weaker than the other.

Ocular asymmetry is extremely common therefore you may only require correction in just one eye. However, there are other reasons why plano lenses can be used.

  • No SPH power required
  • Blindness in left or right eye
  • Computer, blue light blocking glasses
  • Stage/acting purposes
  • Fashion purposes

 

The difference between plano and demo lenses

Plano lenses are usually made of a polymer resin called CR39. They are comparably thicker than demo lenses and will usually have additional lens coatings such as anti-glare and anti-scratch. These coatings yield purple and/or green hues when light is reflected from the lens.

Demo lenses are usually made of thin acrylic which is comparably more flexible to the touch. They don’t have any additional lens coatings which produce a plain white reflection. Furthermore, demo lenses are commonly labelled or pad printed with brand name or company information.

 

Comparison of plano lenses and demo lenses in a spectacle frame

Left: Plano lenses with purple and green reflections | Right: demo lenses

 

Can you wear demo lenses?

Other than retail showroom scenarios, demo lenses aren’t suitable for daily use. They are flimsy, unreliable and provide no ultraviolet or blue light protection for your eyes.

 

Plano lenses cost

The easiest way to calculate the cost of your prescription lenses is by using our online calculator. There, you can tailor your lenses exactly the way you want them. It’s simple, quick and accurate.

 

 

Jamie Bartlett
Jamie Bartlett

Co-founder of Banton Frameworks.



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