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Standard Lens

1.50 Index Cr39 Plastic Thickness Comparison Chart

Our standard lens is single vision 1.5 index Cr 39 plastic resin  and is adequate for most people. They are made exactly to your prescription and are suitable for general wear.

TRIVEX

1.53 Index
  • The very latest from the USA also known as TRILOGY and PNX
  • This lens is truly amazing ( almost indestructible )
  • Very strong and light with high impact resistance
  • Ideal for sports protection
  • Super for rimless spectacles ( Guaranteed against splitting even in a rimless frame for the life of the prescription )
  • UV protection up to 380nm

Mid Index Plastic

1.56 Index
  • This lens is slightly thinner than the preferred and much stronger 1.50 index standard Cr 39.
  • It's value becomes evident when mid range prescriptions are fitted into ful rimmed frames.
  • 1.56 index lenses usually have a slightly flatter curve, giving a cosmetically more flattering appearance.

 

POLYCARBONATE

1.59 Index
  • Very strong and light with high impact resistance
  • Ideal for sports protection
  • Used widely for rimless spectacles
  • UV protection up to 380nm
  • THIS LENS IS ALSO NOT SUITABLE FOR TINTING

HIGH INDEX

1.60 Index Thickness Comparison Chart

A thin lightweight lens ideal  for the short sighted wearers

  •  Hard coated to resist scratching
  •  Multi anti-reflection coated for enhanced night driving or Hard coat only
  •  UV protection up to 380nm
  •  Good cosmetic appearance ( Smaller frames give thinner appearance with minus prescriptions )
  •  THIS LENS IS NOT SUITABLE FOR TINTING
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HIGH INDEX

1.67 Thickness Comparison Chart

A thinner lighter lens for short sighted wearers

  • As much as 25% thinner than the 1.60 index lens
  • Aspheric design reduces chromatic aberration and edge distortion giving good all round vision
  • Hard coated to resist scratching
  • Multi anti-reflection coated for enhanced night driving
  • UV protection up to 380nm
  • Good cosmetic appearance ( Smaller frames give thinner appearance with minus prescriptions )
  • THIS LENS IS ALSO NOT SUITABLE FOR TINTING
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HIGH INDEX

1.74 Thickness Comparison Chart

The thinnest lightest resin lens available today

  • As much as 35% thinner than the 1.60 index lens
  • Aspheric design reduces chromatic aberration and edge distortion giving good all round vision
  • Hard coated to resist scratching
  • Multi anti-reflection coated for enhanced night driving
  • UV protection up to 380nm
  • Good cosmetic appearance ( Smaller frames give thinner appearance with minus prescriptions )
  • THIS LENS IS ALSO NOT SUITABLE FOR TINTING
Lens Thickness Comparison   -6.00   +4.00
1.50 Index Our standard lens is single vision 1.5 index Cr 39 plastic resin  and is adequate for most people 1.50 Index
1.56 Index The tensile strength of this index is lower than any other in general, although some brands have overcome this problem. It is slightly thinner than 1.50 but its lack of strength renders it unusable for Rimless. 1.56 Index
1.60 Index Our lowest priced thinner lens. 1.60
1.67 Index Our mid priced thinner lens i 1.67
1.74 Index 1.74
As you can see demonstrated in the above chart, the saving in lens thickness is most dramatic when used in high minus prescriptions.
 

Transition

Lenses
  • Transition lenses have a very thin layer of photochromic material bonded onto the front surface of the lens, thus giving an even density when activated.
  • There do exist some other less attractive photochromic lenses that change colour throughout the entire thickness of the lens, they are cheaper to make but give a darker tint in thicker areas of the activated lens and have a patchy appearance.
  • We only supply genuine Transitions lenses not cheaper poor performance lenses as supplied by some other less scrupulous companies.

sun reacting lens

 

Polarized

Lenses

  • Conventional sunglasses reduce brightness, but polarized lenses completely eliminate glare, which reduces eyestrain and squinting.
  • Polarized lenses channel light in just one direction, eliminating reflections and letting you see the whole picture.

 
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Anti-reflection

Coats
  • Incorporate several layers of mineral deposits, which usually are  applied to both lens surfaces. The various manufacturers and Anti Reflection coating companies determine the number of layers applied to each surface for their own brands. 
  • Help reduce glare for clearer viewing, which means less eyestrain and fatigue for the wearer.
  • Also improves eye contact by eliminating reflections from the lens surface
  • Also reduce the appearance of the concentric ring effect on high-minus lenses.

Link to Zeiss demo of Antireflection Lenses

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Silver Mirror Coating
  • This spectacular silver coloured coating is effectively a two way mirror, you can see out but no one can see in.
  • Silver Mirror coatings are mainly use on sunglasses " they help reduce glare "
  • And sports goggles for the same reason.
Gold Mirror Coating
  • This spectacular gold coloured coating is effectively a two way mirror, you can see out but no one can see in.
  • Gold Mirror coatings are mainly use on sunglasses " they help reduce glare "
  • And sports goggles for the same reason.
Gunmetal Mirror Coating
  • This spectacular gunmetal coloured coating is effectively a two way mirror, you can see out but no one can see in.
  • Gunmetal Mirror coatings are mainly use on sunglasses " they help reduce glare "
  • And sports goggles for the same reason.
  • Gunmetal coatings are also available as a semi mirror finish " people can just about see your eyes "
Hard Coated Scratch Resistant
  • Cr39 plastic lenses can scratch quite easily if not treated carefully, so a much harder plastic coating is added to the surface to help reduce scratching.
  • We do not charge for scratch resistant coating on any lens we supply.
Complex Prescriptions
  • Applies if your sph and cyl added together is greater -/+ 6.00 or your cyl is greater than -/+ 2.00 or a prism is prescribed
  • If your prescription is outside our websites scope click here

Bifocals

Are eyeglasses whose corrective lenses each contain regions with two distinct optical powers. Bifocals are most commonly prescribed to people with presbyopia who also require a correction for myopia, hypermetropia, and/or astigmatism.

Franklin's original bifocals were designed with the most convex lenses (for close viewing) in the lower half of the frame and the least convex lenses on the upper. Up until the beginning of the 20th century two separate lenses were cut in half and combined together in the rim of the frame. The mounting of two half lenses into a single frame led to a number of early complications and rendered such spectacles quite fragile. A method for fusing the sections of the lenses together was developed by Louis de Wecker at the end of the 19th century and patented by Dr. John L. Borsch, Jr. in 1908.

Today most bifocals are created by molding a reading segment into a primary lens and are available with the reading segments in a variety of shapes and sizes. The most popular is the 28 mm flat-top bifocal [ Also known as the straight-top or D-segment), 28 mm wide].

Plastic D28 Straight Top is our standard bifocal type.

When ordering bifocals we need to know the Pd measurement and the height of the reading segment, this can be obtained by uploading your calibrated image and trying on your selected frame in our click and measure virtual mirror.

If no heights are stated on orders received by Budgetspex an average ht will be used.

Bifocals D28 Segment also known as 28 straight top D28 Straight Top

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Trifocals

Are eyeglasses whose corrective lenses each contain regions with three distinct optical powers. Trifocals are most commonly prescribed to people with presbyopia who also require a correction for myopia, hypermetropia, and/or astigmatism.

Today most Trifocals are created by molding or fusing a reading and intermediate segment into a primary lens and are available with the reading segments in only a small variety of shapes and sizes.

The most popular is the 28 mm flat-top Trifocal.
Trifocal

D28 Flat TopTrifocal

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Varifocals

A varifocal lens corrects vision at various focal lengths - near, far and intermediate.

Varilux invented varifocals and sometimes these two names can be confused.

However, it is important to remember that not every varifocal is actually a Varilux lens. As well as inventing varifocal technology in the 50s, Varilux has been responsible for many great strides in its development. Today, the period of adjustment to Varilux varifocals is shorter than with other varifocals.

Varilux lenses give you sharp, effortless vision from short to mid to long distance and back again.

All Varilux lenses now bear a tiny laser etched signature to ensure you have the genuine product.

You also receive a 'Certificate of Origin' in the form of a Guarantee Card, and all Varilux lenses are covered by an adaptation guarantee which means your optical supplier will replace the lens with another type of lens in the very unlikely event that you are unhappy with your Varilux lenses.

Budget Varifocal

Our budget varifocal is a Varilux Liberty, made by a leading UK manufacturer who advertise their products regularly on TV

Premium Varifocal

The premium varifocal we supply is a Varilux Comfort made by a leading UK manufacturer who advertise their products regularly on TV

All Varilux lenses are covered by an adaptation guarantee which means we will replace the lens with another type of lens in the very unlikely event that you are unhappy with your Varilux lenses.

When ordering varifocals we need to know the Pd measurement and the height of your pupil within your selected frame, this can be obtained by uploading your calibrated image and trying on your selected frame in our click and measure virtual mirror.
Grey Transition Lenses
  • Transition lenses have a very thin layer of photochromic material bonded onto the front surface of the lens, thus giving an even density when activated.
  • There do exist some other less attractive photochromic lenses that change colour throughout the entire thickness of the lens, they are cheaper to make but give a darker tint in thicker areas of the activated lens and have a patchy appearance.
  • We only supply genuine Transitions lenses not cheaper poor performance lenses as supplied by some other less scrupulous companies.
  • Grey Transitions I would describe as a cooler colour.
Brown Transition Lenses
  • Transition lenses have a very thin layer of photochromic material bonded onto the front surface of the lens, thus giving an even density when activated.
  • There do exist some other less attractive photochromic lenses that change colour throughout the entire thickness of the lens, they are cheaper to make but give a darker tint in thicker areas of the activated lens and have a patchy appearance.
  • We only supply genuine Transitions lenses not cheaper poor performance lenses as supplied by some other less scrupulous companies.
  • Brown Transitions is a much warmer colour than the Grey Variety

sun reacting lens

 
Grey VTI Respond Lenses
  • Grey Respond Lenses lenses have photochromic material throughout the entire thickness of the lens, they are cheaper than transitions to make but give a darker tint in thicker areas of the activated lens, thus giving a slightly patchy appearance.
  • At present we don't supply Grey Respond Lenses, but our initial lab tests of this product have been very promising, the tensile strength has been found to be reasonable and because of the slightly higher index "1.56" they are a little thinner than true Transitions.
  • The biggest drawback seems to be that once activated they don't clear as completely as Transitions lenses, but this is reflected in the slightly lower price.
Brown VTI Respond Lenses
  • Brown Respond Lenses lenses have photochromic material throughout the entire thickness of the lens, they are cheaper than transitions to make but give a darker tint in thicker areas of the activated lens, thus giving a slightly patchy appearance.
  • At present we don't supply Grey Respond Lenses, but our initial lab tests of this product have been very promising, the tensile strength has been found to be reasonable and because of the slightly higher index "1.56" they are a little thinner than true Transitions.
  • The biggest drawback seems to be that once activated they don't clear as completely as Transitions lenses, but this is reflected in the slightly lower price.
Grey Sunsensor Lenses
  • Grey Sunsensor Lenses lenses have photochromic material throughout the entire thickness of the lens, they are cheaper than transitions to make but give a darker tint in thicker areas of the activated lens, thus giving a slightly patchy appearance.
  • At present we don't supply Grey Sunsensor Lenses, our initial lab tests of this product have not been very promising, the tensile strength has been found to be low, because of the slightly higher index "1.56" they are a little thinner than true Transitions.
  • The two biggest drawbacks seem to be that once activated they don't clear as completely as Transitions lenses, and they are completely unsuitable for fitting into rimless and semi rimless frames.
  • They are significantly cheaper than true Transitions.
Brown Sunsensor Lenses
  • Brown Sunsensor Lenses lenses have photochromic material throughout the entire thickness of the lens, they are cheaper than transitions to make but give a darker tint in thicker areas of the activated lens, thus giving a slightly patchy appearance.
  • At present we don't supply Brown Sunsensor Lenses, our initial lab tests of this product have not been very promising, the tensile strength has been found to be low, because of the slightly higher index "1.56" they are a little thinner than true Transitions.
  • The two biggest drawbacks seem to be that once activated they don't clear as completely as Transitions lenses, and they are completely unsuitable for fitting into rimless and semi rimless frames.
  • They are significantly cheaper than true Transitions.