Posts in Help Guides Category

10 Essential Points when Buying Glasses Online

In the modern digital age, with all the technology available to us, its so easy to buy amazing prescription glasses online. You should be able to purchase top quality glasses and lenses at a fraction of the cost, without even leaving your armchair.

Our ultimate guide to Buying Glasses Online

1. Do i need to purchase glasses from the place i had my eyes tested ?

Absolutely Not! Do not let the sales person force you into buying new glasses from them. Each optician will be told they must sell new glasses to over 75% of the people they see. Some will even say there is a change when it is so small or does not exist just to make a sale. Then they have huge mark ups on the glasses and lenses, which you are under no obligation to buy. Take a copy of your perscription and you will be amazed at the savings you will make buying your new glasses online.

2. Do i have an up to date prescription?

Have you had a sight test within the last two years? Everybodys eye prescription will change organically over time, so its important you use the latest prescription whenever possible. Recently this has not been possible for alot of us, so some online stores have been accepting prescriptions which are older than two years. But now we are coming out of lockdown, its advisable to get a new prescription if needed.

3 What do i want my new glasses to do?

Do i need to use them for driving, reading or a combination of the two. If you are under the age of 40 then chances are you will just need glasses for distance vision, these will also automatically work for reading and anything else like computer.

If however you are over 40 then you will start to need glasses for reading, above and beyond your distance glasses prescription. This is called presbyopia and it effects everybody and can start early at 38 or even 45 for some people.

If this is affecting you, then its time for varifocals or bifocals.

4. Make sure you get quality lenses, which are correct for your prescription.

If you need varifocals, then the best varifocals available are called digital or freeform lenses. They use the latest in computer aided design to minimize any side distortion, which can be an issue in basic varifocals. Comparing digital freeform varifocals with a older standard varifocal is like comparing small wooden tennis rackets with the newer large size graphite ones!

5. Make sure to choose the correct lens thickness for your personal prescription.

lens thickness start at 1.52, this lens is only really suitable for prescriptions up to +/- 3.00. Any stronger than this and the lenses will look thick and be heavy.

The next thickness is 1.56, which makes the lenses about 20% thinner.

Next is 1.60/1.61, this will be approx 30% thinner.

The thinnest lenses available are 1.74, these are approx 40% thinner than standard.

6. Do i have to E mail my prescription ?

Where it is possible allways E mail your prescription.You will be able to input your prescription on the site, but its allways good practice ton send your prescription so there can be a zero error rate.

7.Check turnover times,how quick will you get your glasses?

You should be looking at 7 to 10 days for most single vision lenses, and 10 to 14 days for any bifocals or varifocals.

8 Are your glasses made by qualified opticians at every stage of the manufaturing process? 

At GTTM only people who are fully qualified in all aspects of eye care, from testing the eyes to making the glasses, fully oversea the manufaturing process.

9 Customer Satisfaction

Are the glasses what i ordered?

 Do my frame look like the glasses i ordered on the website, are they the correct colour and size? 

10. Packaging and Finish

Have my frames been protected during transport to me?

,Do the lenses sit in the frame correctly, with no sharp edges, no overhang and a clean smooth finish.

Blue Guard Lenses

Blue light is a type of light which is emitted from electronic devices such as mobile phones, tablets and computers. It is known that this type of high energy light can damage the photosensitive layer at the back of our eyes called the retina.

Our Blue Guard lens will prevent any blue light from getting to your eye by filtering it out. This will eliminate any digital eye strain, allowing you to work for longer without getting tired. Your eyes will much more comfortable when looking at the screen, making working on the computer more enjoyable.

Frame size from your existing glasses

When you are selecting your new glasses, it would be a good guide
to use the measurements of your old glasses, so you will know your new
glasses will fit.

Your old frames will have some numbers on them, which are usually on the arm or side of your glasses frame.

  1. The first number is the lens diameter. This is the width of the lens measured in mm. The lens diameter is very much a matter of personal choice, but may also be determined by your chosen frame style which should suit your face shape and size. 
  2. The second is the bridge width.        This is the gap above your nose between the lenses. This measurement is crucial for making sure your new glasses fit comfortably. If the bridge size is too small, the glasses could pinch your nose. Conversely, if it is too wide, your new glasses may not be stable on your face. 
  3. The third number is the side length. This is the overall length of the side as measured from the hinge to the end of the side. Typically, side lengths come in one of three standards; 135mm 140mm or 145m.                                            When choosing an side length, remember that the side should be long enough to sit comfortably over and behind your ears. Please remember that glasses with straight sides may not always have this measurement indicated.
Frame size numbers location

How to read your Prescription?

So, you have had your eye test and have been given your glasses prescription, but what do all the numbers mean?

How to read your Prescription?
How to read your Prescription?

In this example, the first number is called the “spherical power,” (SPH) and this is what tells us if you are short sighted, (-) like this example, or (+) long sighted.

The second column ( CYL ), is cylinder power. This tell us how much astigmatism is present.

The next column is ( AXIS ). This will always be a value between 1 to 180 and relates to the orientation of the CYL power.

How to read your Prescription?

If your prescription does not contain a PD (Pupillary Distance) value, then check out our ” How to measure your PD”

How to Measure Your PD

Your PD, or pupillary distance, is important when ordering your glasses online, as it is the distance between your pupils, measured in millimetres.

This measurement is important to help us deliver the clearest possible vision in your new glasses.

Your PD is usually written as one value ( e.g. 64) but can be written as 32/32 if your eyes are a equal distance from the bridge of your nose, or written 31/34, if one eye is slightly further away than the other.

Average PD measurements for women are 62 with men at 64.

Measure your PD image

How to measure it yourself

We do encourage you to ask your optician for your PD measurement. 

If your optician is reluctant to give you this, you can take a very simple measurement yourself by just using a normal ruler.

Use a normal MM ruler and standing at arm’s length from the mirror, put the 0 of the ruler level with the edge of your pupil nearest to your nose. Then, keeping the ruler in place, look straight ahead and read the measurement from the edge of your pupil in your other eye, but this time use the outside edge of the pupil (see diagram).

 This will allow for a more accurate reading as it is sometimes difficult to pinpoint the centre of the pupil.