Why Don't My Transitions Work in the Car?
Not all transitions lenses actually work the same way in the car as they do anywhere else – they darken in reaction to the presence of ultraviolent (UV) light. The problem stems from the fact that most modern car windscreens already filter out harmful UV rays. Your windscreen is normally quite different from the rest of your glass, in that it’s two pieces of glass laminated with a layer of plastic – vinyl – in between. You then have a triple-layer system…which contains UV inh
Polarized Sunglasses vs Standard Tinting
Ultraviolet rays from the sun are incredibly damaging to our eyes, so proper eye protection is important at any time of year. However, choosing the right sunglasses is no easy task with so many choices available. Polarized sunglasses are specialized eyewear designed to reduce GLARE from surfaces such as water, snow and glass. First, we need to know what GLARE is. Glare is difficulty seeing in the presence of bright light such as direct or reflected sunlight. It can generally
Should I Buy Ready Readers?
Ready readers; they’re everywhere. In the local supermarket or high street store, at some “too good to be true” prices too. But just what are the advantages and disadvantages of buying an off the shelf pair of reading glasses, as opposed to a pair prescribed by your local optician? Ok, yes; they may save you money in the short term, but cheap reading glasses could actually end up costing your eyesight. The so-called ‘ready readers’, which sell for as little as £1 in high stre
Mathematics in Optics!
It may not be surprising to hear, as in most subject areas, that there is a substantial amount of mathematics in Optics. Luckily for most of us (or unluckily if you like maths) this maths is ‘hidden’ by using rule of thumb systems, data tables or computer software that does all the work for us. This is also largely true of Optics, though there are some purists out there who prefer the aid of mathematical equations in deriving specific results. I am naturally one of those puri
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