Coloured Contact Lenses

Sunglasses work mainly as protective items and only secondly as decorations. There are however people who cannot buy a pair of sunglasses and enjoy them because they have special eye conditions. This is the case with anyone who suffers from myopia, astigmatism or hyperopia. Prescription sunglasses could be a solution for improving sight and protecting eyes from the action of the UV radiation at the same time. On the one hand the UVA rays get absorbed in the body through the eye lens, and on the other, the UVB rays cause skin burn.

Prescription sunglasses represent a combination of regular glasses with a dark lens design. Prescription sunglasses use different types of lenses, and here we can count polarized lenses, anti-reflective lenses, blue blockers, photochromic lenses and gradient lenses. It is important to mention here, before going on with the description of prescription sunglasses, that you can only order this kind of eyewear based on an ophthalmologist’s recommendation and after careful medical examination. Some health condition such as eye surgery may require total prevention of sun exposure. This is why most often doctors prescribe sunglasses with  99 or 100% protection against UVA and UVB.

Some prescription sunglasses rely on a wraparound design that prevents the UV rays from entering from the sides. Here, the choice of the frame is everything because it should be large enough to allow for such protection. As for the anti-reflective properties, not only prescription sunglasses but most sunglasses in general have a special anti-reflective coating that ensures superior reflexion of the light. Mirror-coated lenses are sometimes used for the same purpose of reducing glare. The stage of the eye condition will also have an influence on the design of the prescription sunglasses.

It is sometimes difficult to create functional prescription sunglasses for advanced forms of myopia where the thickness of the lenses is very high. The presence of two or more health problems at the same time could also become an obstacle for the design of prescription sunglasses. The doctor should be able to recommend an adequate course of action, with the mention that the design of highly specialized prescription sunglasses is more difficult. Moreover, price awareness is another important element given the fact that prescription sunglasses will always be more expensive, as the number of specialists who can design them is smaller too.

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When the author isn’t wearing her prescription sunglasses, she’s a fan of best psychics, the Seattle HCG diet, and the Cadillac Allante windscreen windblocker wind deflector.

Match your eye glasses to your personality

In this competitive world of ours, image is everything. And even if you don’t think of yourself as being ‘image-oriented’ deeper insight into your personality might lead to startling revelations. Either way, when it comes to choosing eyeglasses, it’ll be worth your time to look for a style that fits your personality.

That’s not to say that if you’re feeling blue, you should opt for blue-colored frames or lenses. What it means is that before you head over to the ‘discounted frame’ section, you need to stop and think about who you are and how you live.

Are you older, younger or somewhere in between? Do you consider yourself to be trendy or conservative? Do you have a career or are you a student? What is your career or your area of study? Are you driven by name brands or do names not impress you? Do you look at eyeglasses as a fashion accessory or a necessary evil?

If you’ve answered these questions, you might wonder, ‘Now what? So what if I’m days away from becoming a Baby Boomer and I work a desk job? How is this going to help me choose an eyeglass style?’

Well, one solution is to discuss these self-analysis results with your optician so that together you can work towards finding a suitable pair. A good optician will know which styles are ‘in’ and which are finally on their way ‘out’. He or she may also be familiar with matching eyeglass shapes, styles and coloring to face shapes, much in the same way as a hairdresser can usually recommend a flattering hairstyle.

Plus an experienced optician will know the inventory well. He or she will know how long a particular pair will take to order, about the materials used in each of the various manufacturing processes and whether they’re durable or delicate, about the total costs involved from start to finish for the various styles, and other types of useful information that you may not have thought about.

But if you’re still confused as to which eyeglass style will best match your personality, here are a few more tips.

If you run in conservative circles, stick with conservative styles and colors. Neutral colors including brown, gray and silver and standard lens shapes such as rectangles and ovals are good choices.

If you prefer to be the center of attention, then choose eye glass styles that will get noticed. Look for unusual shapes and bold colors. If the price is right, get several pairs so you can mix and match with your wardrobe and other accessories.

If you like trends but want a style that has staying power, look at the newest materials being used for eyeglasses such as titanium, stainless steel and memory-metal.

Students and those with a creative or artistic flair look best in styles that help express their individuality. There are no rules here except to steer clear of ‘traditional’ styles.

Choose specialty styles if you need eyeglasses for a specific purpose such as working at a computer, eye protection, sports and hobbies or driving.

Contact Lenses and How The Eye Works

The human visual system is both simple and complex. Complex, because there are so many parts that have to work together to make sight possible. Simple, because those parts and the process can really be explained without in-depth knowledge of anatomy and biology.

An ordinary glass lens, such as a magnifying glass, focuses the light that moves through it by bending the rays toward a focal point. That’s the bright spot you see when you hold one over a newspaper, for example. Something similar happens when light enters the eye through an opening called the pupil, behind a clear protective portion called the cornea.

The pupil is surrounded by the iris, the colored portion of the eye. The pupil can narrow or widen to regulate the amount of light admitted, from as small as about 2mm to as much as approximately 8mm. The iris contains the muscles that change the diameter of the opening. Just behind the pupil is the lens, the part that focuses the light rays similar to the magnifying glass.

But there’s an important difference between a magnifying glass and the eye. The magnifying glass’s focal point is fixed. The eye, by contrast, contains muscles that help shape the lens and that shaping process performs a number of important tasks. Most importantly, it makes it possible for the focal point to change.

A camera lens is a good analogy. Because the camera lens contains multiple pieces of glass that can be moved by turning the barrel, objects at different distances can be brought into focus on the film. The muscles attached to the lens perform a similar function in order to focus light onto the retina, which is like the film.

Focused light rays strike the cells of the retina, the cones and rods. The names come from the shapes of the cells. The cones – 7 million cells in the central part of the retina, called the macula – are responsible for sharp, detailed vision and color vision. The approximately 100 million rods around them help us see in dim light and provide peripheral vision.

When those focused light rays hit the cells chemical reactions occur that stimulate the optic nerve attached to the back of the retina to produce electrical impulses. Those impulses are then transmitted to the visual cortex, the part of the brain that organizes them. Many parts of the brain cooperate to cause the mind to conclude: ‘Ah, a car.’ But the visual cortex does the initial heavy lifting.

When the parts and process of vision work correctly, you see sharp, colored entities out in the world. When things go wrong, the need for contact lenses or eye glasses arises.