CAT CTO 'S08' Prescription Glasses Online

Lenses
Prescription
Frame Size
Pupillary Distance

        Help with your Lens Options

Here at internetspecs.co.uk, we have kept our lens options simple and sometimes FREE. Because of their high overheads, high street opticians need to charge you a lot for both frames and lenses. Online opticians will often make high profits on just the lenses. We have chosen to do neither! Our overheads are not high so there is no need to have our prices high - good for you!

•   We have FREE Clean & Clear 1.6 Thin & Lightweight Anti-
  Reflection (AR) Lenses for all of our prescription glasses*
  (Single Vision only). These lenses will be noticeably thinner and
lighter than standard 1.5 or 1.56 lenses.

(You may have noticed that our Cylinder (CYL) drop-down forms
    opposite for the left and right eyes only go up to -2.00.
   However, for our 1.6 lenses, if you have a negative Sphere (SPH)
    reading, we are still able to supply, for free, CYL's higher than
    -2.00, up to -4.00. You won't be able to input this onto our
    forms so please either upload a copy of your prescription to us
    or tell us in the 'Any Additional Information' form).

•   Our Clean & Clear 1.67 Extra-Thin Anti-Reflection (AR)
Lenses (at just £22 extra) are even thinner and more
lightweight than our free 1.6 lenses. They are great for any
prescription but are particularly good for those who have a
   high prescription (sphere (SPH) reading above +/- 2). Our 1.67
   lenses are always Aspheric. Aspheric lenses allow the lenses
to be made thinner and flatter.

(You may have noticed that our Cylinder (CYL) drop-down
   forms opposite for the left and right eyes only go up to -2.00.
   However, for our 1.67 lenses, if you have a negative Sphere
    (SPH) reading, we are still able to supply, for no extra cost,
   CYL's higher than -2.00, up to -4.00. You won't be able to
   input this onto our forms so please either upload a copy of
   your prescription to us or tell us in the 'Any Additional
   Information' form).

•   Our Clean & Clear 1.74 Ultra-Thin Anti-Reflection (AR)
  lenses are the thinnest and most lightweight plastic
lenses available and cost just £75 extra. They are only
  available from us if you have a negative prescription (the
Sphere (SPH) reading). We recommend choosing a 1.74 lens
if your prescription is higher than -4.50 for the Sphere (SPH)
   reading (i.e: from -4.50 to -8). Our 1.74 AR lenses are also
    Aspheric which contributes to the lenses being thinner
   and flatter.

•   Please select 'Frame Only' if you just require the glasses
  frame. These will be posted to you with 'dummy' (low quality
    plastic) lenses that you can easily take out (we do not
   recommend wearing glasses with dummy lenses).

•   Our 1.5 & 1.6 Transition® lenses (known as 'Photochromatic
   Lenses' and available in either grey or brown), change
  colour in sunlight, meaning that you can use them during
    the day or at night. They are temperature dependent,
    darkening better in colder climates such as Northern Europe
    (in snowy conditions, they become extra dark, due to the
   intense ultraviolet light). Transitions® need ultraviolet rays
    from daylight to darken, meaning they're not always
   suitable for behind a car windscreen (our Polarised lenses
    are good during sunny driving conditions - please see
   below). The lenses without anti-reflection AR coating are
    darker in sunny conditions, whereas with anti-reflection
    AR coating, they are better inside and at night because
    they are lighter in colour. The thin 1.6 Transition® lenses
    come with an AR coating. The higher lens index value (1.6)
    causes reflections to increase. Having an AR coating helps
   to eliminate this.

• Our Blue Protect lenses help to filter out blue light rays
  that can be found in artificial light sources such as mobile
phones and tablets. There's been research showing that
too many blue light rays could disrupt our internal body
  clock that controls our sleeping and waking cycles.
  Blue Protect comes in standard 1.5 thickness lenses, thin
  & lightweight 1.6 lenses and extra-thin & lightweight 1.67
lenses.

• Our 1.6 Honeycomb (AR) lenses have a coating of tiny
   hexagonal interlocking shapes (only visible when
inspected closely or when the lens mists) that helps to
reduce light scatter and glare, improving vision clarity.
   The benefits of the lens are found both in bright and
low light settings.

•   Our 1.59 AR Polycarbonate lenses are good for sport as
     they are tougher than normal lenses. They're know as
     'plastic aluminium' - weight for weight, they're four times
   the strength of aluminium - the material is used for riot
   shields. Because they're 1.59, they're also thin lenses.

     Please note:
Our brown and grey 1.5 Transitions® and our 1.59
  Polycarbonate lenses have a more limited prescription
range than we have for all our other lenses. Certain
  prescriptions will require more expensive 'surfaced'
  lenses. If this is the case for you, we will contact you
very soon after you place your order to ask if you wish
to pay the extra cost for 'surfaced' lenses or if you wish
  to upgrade to 1.6 Transitions® or if you wish to change
or cancel your order.

• Our 1.53 AR Trivex lenses are impact resistant. They are
just as strong as Polycarbonate lenses but are even
more lightweight and have slightly sharper vision,
   although Trivex lenses aren't as thin as the 1.59
   Polycarbonate lenses are.

• Our 1.5 Nupolar® Polarised sun lenses are tinted and
  eliminate glare, offering 100% protection from harmful
  UV rays. They're ideal for those sunny sunrises and
sunsets when you can be 'blinded' by the sun, even while
wearing 'normal' sunglasses. Polarised lenses must not
be worn while driving at night. They come in 3 different
  colours: grey, brown and green.

• Our standard 1.5 Tinted Sun Lenses and our thin and
  lightweight 1.6 Tinted Sun Anti-Reflection (AR) Lenses
  are ‘fixed tint’ (they are always coloured and so are for
  day use only). They will absorb 85% of sunlight. Our 1.5
Tinted Sun Lenses come in 3 different colours: brown,
grey and green, whereas our 1.6 Tinted Sun AR Lenses
just come in brown and grey. Our 1.6 Tinted Sun AR
  Lenses are only available from us if you have a negative
prescription (the Sphere (SPH) reading).


* Occasionally, for those with a low prescription (sphere
   (SPH) reading around Plano (0) to 2) selecting a pair of
    semi-rimless (supra) glasses, we may have to use a special
'surfaced' lens to enable glazing to occur. Here is the
    technical bit! - for semi-rimless glasses, the edges of the
lenses have to be thick enough to allow a groove to be
    cut to hold the nylon thread. On occasion, a 1.6 lens will
    be just too thin. Please be assured that we'll contact you
    before we do this to make sure you're happy with us
    using a special 'surfaced' lens. We may need to ask for an
   additional payment for this.

* In the instance that you have a positive (+) prescription
   sphere (SPH) reading, you have a small pupillary distance
measurement and you choose a wide frame, we may have
to use a special lens (known as a ‘surfaced’ lens) to get the
centre of the lens in the correct place. If this occurs for
  you, we will need to ask you for an additional payment.
  Please be assured that if this case arises for you, we will
contact you soon after you place your order to ask if you
  wish to pay for the special lenses or if you wish to change
or cancel your order.

Help with your Prescription

Before you order prescription glasses at internetspecs.co.uk, you need to have a copy of your prescription that was given to you at your last eye test. To order from us, this needs to have been within the last 2 years. If it has been longer than this time (or you have never had your eyes tested), please go to an optician and get an eye test.

After the examination, ask for a copy of your prescription - the optician is legally obliged to give it to you. Then you'll be ready to order your prescription glasses online from us. You can also ask the optician to give you your Pupillary Distance (PD) measurement, although he/she does not have to give you this (there may be a small fee - see our ‘Pupillary Distance' section for more on this).

On your prescription, abbreviations will more than likely be used:

• ‘R’ will refer to your ‘Right Eye’

• ‘L’ will refer to your    ‘Left Eye’

• ‘SPH’ will refer to    ‘SPHERE’

• ‘CYL’ will refer to ‘CYLINDER’

• ‘ADD’ or ‘NEAR’ refers to ‘NEAR
   ADDITION’

SPHERE (SPH)

This figure designates the strength of lens needed to correct your focus: A positive (+) SPH for long sightedness (problems focusing on close objects) and a negative (-) SPH to correct short sightedness (problems focusing on far objects). If you are neither short nor long sighted, on your prescription, you will see the word PLANO or PL, or the figure 0 (sometimes 0.00), or the sign for infinity: ∞   However, this does not necessarily mean you have perfect eyesight as you may have an astigmatism (see below).

CYLINDER (CYL)

The CYL figure helps to correct an Astigmatism - which means the eye has problems focusing at particular angles. The eye will be slightly rugby ball shaped rather than football (soccer for our American customers!) shaped. This box on your prescription MAY BE EMPTY, in which case you do not have to put anything in the ‘CYL’ part on our prescription form. Similarly, an optician may write: ‘DS’ in the CYL box. If you see this, you can ignore the ‘CYL’ part of our form.

AXIS

There will only be an AXIS figure if you have a CYL figure. It tells us where exactly on your eye the astigmatism is. Be particularly careful inputting this figure to us. It is measured in degrees from 0 to 180. Occasionally there will be a 1/2 or .5 figure.

NEAR ADDITION (ADD)

The ADD('s) is the Additional correction needed for READING and/or COMPUTER USE. The figure is almost always the same for each eye so if it is just written once on your prescription, do not be confused - you can just add the same figure into both boxes on our form.


          SOME IMPORTANT POINTS

•   Some prescriptions will include a figure in the
    PRISM section. The prism helps to correct such
    conditions as muscle imbalance problems. If
    your prescription includes a figure in the prism
    box, please get in touch with us through our
    ‘Contact Us’ page and we may be able to help
    you but it will involve an additional cost.

• Please double check you have entered the (+)
    and (-) correctly into our form

• Sometimes an optician may, for example,
   write: +050 or +175 for the SPH, CYL or the
    ADD. He/she has simply omitted the dot and
    you can enter into our form as: +0.50 or
    +1.75

• Sometimes, an optician may write the + or -
    above the figure like this: +       or this:   -
                                                     0.5                 1.5

IF YOU ARE IN ANY WAY UNSURE ABOUT
YOUR PRESCRIPTION, KNOW THAT YOU CAN:

Upload a Scan or a Photo of your prescription to us using the form opposite or

Email (through our ‘Contact Us’ page) or

Post it to us (address found on our ‘Contact Us’ page).

OR, if you need ANY CLARIFICATION, you can call
us on:

+44 (0)1908 965985

             Help with your Frame Size

The simplest way for you to get the right frame size is to read the measurements from a comfortable pair of glasses that you already own. You can usually find the dimensions (perhaps with the help of a magnifying glass) on the inside of the arms/sides of your glasses and occasionally on the inside of the bridge (the part of your glasses that sits on your nose).

It is usually written in the format: 52-17-135 Thankfully, it is easy to distinguish what these numbers refer to:

• The much higher figure (135) is the Arm Length (also known
   simply as the 'Sides').
• The middle figure (52) is easily identifiable as the Eye Size (also
known as Lens Diameter).
• The much lower figure (17) will be the Bridge Size/Width.

They do not need to be an exact fit but the nearer they are to your current pair, the more likely the glasses you buy from us will be a comfortable fit. Please note that the Arm Length is less important in determining a comfortable fit than the Eye Size and Bridge Size are.

If you cannot identify any measurements (perhaps because they have worn away with time), you can either:

1) Visit an optical shop and find a pair of glasses that feel
comfortable. Note down the measurements (ask a staff
   member if you are not sure) and come back to
   internetspecs.co.uk

2) Measure your own glasses. Measurements are in millimetres
so you will need a millimetre ruler:

Bridge Size:
The minimum horizontal distance between the rims on a metal or plastic frame or the minimum horizontal distance between the lenses for rimless frames.

Eye Size:
The eye size is the maximum horizontal width of either one of the lenses on your glasses.

Arm Length:
Measure from the dowel point (the hinge area, where the arm connects to the main part of the frame) to the furthest point of the arm. This involves measuring to the bend and then measuring the drop separately. You can then add together the two measurements to get the final arm length.

What is my Pupillary Distance (or PD)?

Your Pupillary Distance (PD) is the distance between your eyes, measured from the centre of one pupil to the centre of the other. Once we have your PD, we can then ensure that your lenses are made so that the centre of each lens lines up with the centre of your pupils. If you have a high strength prescription, (a sphere (SPH) reading higher than +/-3) a precise PD measurement is very important.

How can I find out my Pupillary Distance Measurement?

Often, your optician will not include your PD measurement on your prescription so you can ask him/her after you have had your eyes tested or get in touch with him/her at a later date (see below on getting your PD measurement from a prescription).

If your prescription is not too high, (a sphere (SPH) reading between -2 and +2) we can make your glasses for you using an average pupillary distance measurement.

You can also measure your PD yourself, although we recommend you have someone help you rather than use a mirror:

   • Place a millimetre ruler against your forehead and the bridge
     of your nose.
   • Line up the zero mark of the ruler to the centre of one pupil.
   • Read the millimetre measurement for the centre of the other
     pupil.
   • Repeat this 3 or 4 times for accuracy.

If your glasses are for reading or computer work, the measurement for your PD is always slightly less than the 'distance' PD. If you are measuring your PD yourself, the measurement you get will be for 'distance'. If you require reading or computer glasses, please enter your PD for distance into our form and tell us in the 'Any Additional Information' box that you measured your PD yourself. We will then adjust the PD measurement if you've ordered glasses for reading or computer. If you don't write anything in the 'Any Additional Information' box, we will take the PD measurement you've entered into our form as the PD required for the specific glasses you have ordered.

Getting your PD Measurement if it is written on your Prescription

If there are 2 PD measurements shown on your prescription, such as 63/60, this will mean that the 63mm figure is for distance use and 60mm will be your reading or computer PD.
If you have just one PD, this will more than likely be your distance PD. You may want to confirm with your optician as there is the possibility this was written with reading or computer glasses in mind.
Occasionally, your optician may write your PD for each eye, for example: 32/31. In this case, please write these figures into the 'Any Additional Information' box. The first figure is always the measurement for the right eye; the second figure, the measurement for the left eye.

PLEASE MAKE SURE THAT THE PUPILLARY DISTANCE (PD) MEASUREMENT YOU WRITE ON OUR FORM IS FOR THE SPECIFIC PRESCRIPTION YOU WANT US TO MAKE - WHETHER IT'S FOR DISTANCE, READING OR COMPUTER. AN EXCEPTION TO THIS IS IF YOU'RE MEASURING YOUR PD YOURSELF (Please see above, towards the end of the section: 'How can I find out my Pupillary Distance Measurement?').

Our Price: £83.00

Availability:

Notify me when this is available

Colour Choice:
Frame Size (mm):	Eye Size: 59 Bridge Size: 17 Sides: 145
Lens Options (Single Vision Only):
Prescription (must select):
Right Eye Sphere (SPH):
Right Eye Cylinder (CYL):
Right Eye Axis:
Right Eye Near Addition (ADD):
Left Eye Sphere (SPH):
Left Eye Cylinder (CYL):
Left Eye Axis:
Left Eye Near Addition (ADD):
What is Your Pupillary Distance (PD)? (must select):
What are the Glasses for? (must select):
Any Additional Information?
Uploading a Prescription Scan/Photo?

Special Offer: Order 2 pairs of glasses / sunglasses and receive the lowest value pair with 20% off....(can be the same pair or different pairs; also applies for reglazes).