About Mike Dixon
Posts by Mike Dixon:
Vista Mesh a unique pair of glasses for computer screens.
At Uk Eyewear we use the Vista Mesh unique lens formulation to help reduce visual stress. Vista Mesh has 6 separate components and offers a range of benefits. Vista Mesh aligns scattered light reflections, it will dampen flicker, it sharpens contrast, reduces eye strain and deflects EMI radiations. But whilst Vista Mesh is most commonly used whilst working at a computer, it has a whole range of other benefits. Use Vista Mesh for night driving they are completely safe and meet requirements for night driving. The lenses are ideal for reducing general eyestrain whilst working in modern office environments that have bright lighting. Clinical afflictions can be helped such as migraine headaches, blepharospasm, and visual floaters. Less tiredness from digital devices such as Ipad’s, LapTops and mobile phones. General reading and writing tiredness can be reduced. And due to the unique way, Vista Mesh arranges the way your brain receives the information it can also help with motion sickness.
Unique 6 part formulation:
- Reflection-free HMAR
- UV385 cut-off filter
- Unique V-M optical mesh filter
- 90% LTF brown contrast filter
- Mid index thinner 1.56 material
- Super Easyclean top coat
We offer Vista Mesh in prescription and none prescription form. The lenses are available as clip-on’s, magnetics, fit -overs in designer frames and as a tester. We also offer free expert advice and frame fitting on a complete range of therapeutic eyewear. If you live in or around the Manchester area, why not call and see us.
Lens a category applies to all tint colours, grey is the most popular. Grey doesn’t distort colour and black is the biggest selling frame colour and let’s face it, it looks really cool. But there is a science to lens tints and it’s important to have an understanding of what it all means. When you buy a pair of sunglasses they come with the percentage of light transmission already selected. When you are having custom made prescription lenses you have the choice. You can select from Cat 0 to Cat 4, you may think Cat 4 is the best when actually it is completely unadvisable to use for driving for example.
So in the real world let’s take a look at each lens category and how it might be used in the world of sport. The 5 categories’ 0 to 4 refers to a band of light transmit ion, the percentage of light that passes through the lens.
Shades of grey:
Cat 0 lenses are either clear or have a very light tint, they are used in safety glasses, sports where you want the maximum light to pass through the lens like football and a range of other in and outdoor sports
Cat 1 lenses in sport are typically yellow used for low light conditions. You would see yellow lenses in glasses and goggles for sports like skiing, shooting and cycling.
Cat 2 lenses in sport are most commonly amber in colour. Cat 2 lenses make a good imtermediate lens and can be used for both dull and bright days. Sports where you would see this lens are Skiing, cycling and shooting.
Cat 3 – is the typical sunglass lens providing protection from both visible and UV light. These lenses will usually only allow less than 20% LVT of visible light to penetrate the lens. This means that they will block out 80%+ of brightlight. These lenses would be used in a wide range of out door sports Cricket, fishing, golf, sailing, tennis, skiing.
Cat 4 – Lenses are much more specialised and are used for extreme applications. They allow only a small percentage of light to pass through the lens approw 5 to 8% LVT. The lenses are used for mediacal condition such as photophobia, after eye surgery. Other extreme uses would be at high altitude mountaineering, out in the artic.
Visible Light Transmission (VLT) - This is the measure of how much light your sunglass lens lets through to your eye and can be expressed as a percentage, therefore a VLT of 1% means very dark glasses indeed, and a VLT of 100% means all the light is getting through and the lens is, therefore, a 'clear lens'.
Rather than quote a percentage for each lens they are categorised as follows:
- Category 0; 80-100% VLT
- Category 1; 46-79% VLT
- Category 2; 18-45% VLT
- Category 3; 8-17% VLT
- Category 4; 3-8% VLT
The condition of Photophobia is a sensitivity to light. People who believe they are Photophobic tend to suffer from a range of conditions including headaches, dizziness, nausea, and migraines. I’m not a great fan of self-diagnosis, so before you spend any money speak to a professional first.
What commonly happens is sufferers look for extra dark sunglasses trying to create the same effect as a darkened room. That will help to treat the symptom, BUT is it the cause? I want to examine both the glasses (how to find true extra dark sunglasses) and secondly the cause, could it be you suffer from a condition called PPD (perceptual processing disorder)
The glasses… The phrase extra dark sunglasses is purely subjective. What one person considers to be extra dark, to someone else, they might just be normal sunglasses that look dark. So what is “extra dark” and just how dark are we talking. That’s where the science comes in. The amount of light that passes through a lens is broken down into 5 categories. The categories range from Cat 0 to Cat 4 a “0” lens is all but clear and allows the maximum amount of light to pass through. If you want to know more about lens categories you can read another article I have written on the subject HERE. We are interested in the categories that stop lots of light and we will start with Cat 3 that’s the category of a normal pair of sunglasses allowing stopping 80% of light to pass through the lens, 20% LVT. So when I refer to a lens that is extra dark, I am talking about a category 4 lens a lens that stops 95% of light (5% LVT) If the seller is genuinely selling “extra dark lenses” they will be quoting Cat 4 and around 5 to 8% LVT. If they are not, chances are you are buying normal sunglasses and that’s not going to help very much. I have provided a link to a frame that I have specially designed that meets Cat4 and 5% LVT, you can use it to compare other frames against.
The cause… Many people think they are sensitive to light when actually, colour can be the culprit. By removing certain colours from the colour spectrum some people have found that to be more effective than the dark lens. Much research has been done on the subject back in the 90s by Birmingham University. They came up with a filter that was given the code name FL-41. The filter mainly works on blues and greens and under test they where getting figures as high as 85% of people who saw a benefit.