![]() It is not scratch proof - no coating is – but it helps to defend your lenses. It is useful if you work in a dusty environment or you’re not too careful with your glasses. Scratch-resistant coating – this protects against normal wear and tear marks. Fashion/non-prescription: blank lenses suitable for those not needing a prescription.Suitable for computer users, not suitable for driving. Occupational/Office d esigned for the office environment.Customised to your frame and includes anti-reflection coating More comfortable for computer users due to increased corridor width.Įlite quality - widest field of vision in all areas. gives improved clarity, focus and ease of adapting to new glasses. Premium quality - wider field of vision at all focal points. Standard quality - entry level varifocal, suitable for general purpose wear. ![]() ![]() To improve the quality of the Varifocal and give increased comfort - increase the width of clear vision in each area, Try pointing you nose at what you want to see when you walk around and only drop your gaze down the lenses when you want to read. Same useful tips for first time wearers - You will not see the floor if you move your to the bottom part of the lenses. If your eyes stray to the edges of the lens, you will not see as clearly as straight ahead. It can take several WEEKS to get used to them. The 3 areas of vision blend into each other so that they look like single vision lens.ĭisadvantage - is that you have to learn where to put your head and your eyes to see clearly. Varifocal (progressive) lenses ( no line) used for all distances.Īdvantages - you can see at every distance – from 40 cm to far in the distance.Īnd they do not have the line across, separating the distance part from the reading part.Useful tip - You will not see the floor if you move your to the bottom part of the lenses. There is no blurred region.ĭisadvantages - the line may look ageing and you will have to learn where to put your head and eyes to see clearly. Below the line you will see close things. Bifocal ( with line) used for distance with a segment for close workĪdvantages - you do not need to keep changing from distance (seeing) glasses to reading glasses when you want to clearly see something close to you.Ībove the line on the lenses, you will see distant things.In this case, you should consider either bifocal or varifocal (progressive) lenses. You just put them on and you can see the distance prescribed.īUT, it might not be convenient changing from 1 set to another. The advantage with single vision glasses is that you do not have to learn how to use them. If you’re interested in furnace observation cobalt blue glass, here’s what you should know:įurnace observation cobalt blue glass is used to decrease the brightness of furnaces during metal and glass work.Ĭobalt blue glass has special properties that both allow you to see better into extremely bright furnaces and allow you to see more clearly and with more contrast the objects you’re working on.Ĭobalt blue glass does not protect from infrared and should not be used in lieu of green IR glass.įurnace observation is almost always the only thing that cobalt blue is safe for, but it works better than any other lens for that function.Reading - used for close work and reading at about 30-40cm, that is 12-18”.Īs you get about 40 years old, you might find you need both distance and close work glasses. ![]() Furnace observation cobalt blue glass is designed with the furnace observer in mind, and it allows those who are observing hot furnaces without IR radiation to see into the furnace so they can reduce eye fatigue and increase their vision of the items in the furnace. Cobalt blue lenses do not protect the eyes from IR radiation like the green IR does, but cobalt blue lenses are not designed for that. Cobalt blue glass is NOT a good substitute for green IR glass.
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