Showing posts with label Understanding. Show all posts
Showing posts with label Understanding. Show all posts

Understanding Color Blindness

Most of us are aware of the term "color blind", but its not always known that there are actually several different kinds of color vision deficiency. Further, the effect that eyeglasses and vision-correction utensils, in general, have on color vision deficient eyes is typically unknown. However, recent research actually reveals that the optical industry has developed new technology to help!

Firstly, the term color blindness is actually a bit misleading. Recently "color vision deficiency" is coming up more often in literature as the meaning is not an actual blindness, but instead: a failure to see color in general, or to be able to pick out differences in color under certain lighting conditions in which color vision isn't formerly hindered. Furthermore, there are different variations of color vision deficiency: monochromacy, dichromacy, and anomalous trichromacy. These three inherited or congenital deficiency types can then be broken down even further. The spectrum goes from fully color blind - or: monochromacy - to specific pigment loss. Additionally, males have a much higher chance of being color deficient than females. The X chromosome carries the gene that generates photopigments, therefore any optical problem would come from it. However, since females have two, they have a much higher probability that one of the X chromosomes will not have any problems, and therefore color blindness would be ruled out for them; as men only have one X chromosome, if its a optically problematic chromosome, they will be effected.

In recent years, with technology continuing to grow, special eyeglasses have actually been invented that can help correct some of the problems associated with it. There is some skepticism in regards to the color blindness-correction eyeglasses, however research is proving that they are in fact working. Of course further studies need to be conducted, however currently this could ideally be a helpful regulation for those suffering from the lack of color in their lives. The eyeglasses have special coatings placed on them - much like sunglasses - that can enhance certain pigments needed for the deficient eyes. They are in no way a cure for color vision deficiency; simply a tool that can help those effected use what they have to see the colors they are missing. At this time unfortunately they have been able to create these special eyeglass lenses that can aid to those who endure red-green color blindness. However, since roughly eighty percent of those suffering from some sort of lack of seeing color have red-green color blindness, it can significantly help for the time being.

Not everyone has picked up on the trend of fixing color blindness vision-correction with their prescription eyeglasses. However, if you have any additional problems with your eyes, you certainly should still invest in a good pair of glasses. So, whether you need your eyeglass lenses to fix simply a vision distortion or color vision deficiency, try to stay as up-to-date as possible on your needs. You only have one pair of eyes, so take good care of them!

Hillary Glaser is the Director of Marketing and Special Projects forGlassesUSA.com - the easiest way to buy glasses online. She over sees day-to-day operations for all marketing and promotions of eyeglasses for the company.

Understanding Eyeglasses and Lenses

The last time you visited your eye doctor, did he or she explain your prescription to you? What about the type of vision correction you need? Were you given any kind of suggestion for what kind of lenses would work best with your prescription or were you left with an optician to make those decision for you? Chances are good that you were left in the dark and this is not uncommon. Many eye doctors will check your vision, hand you a copy of your prescription, and send you off to go purchase eyeglasses with a sales agent. Understanding your prescription is the first step to understanding your eyeglasses and lenses and the following information will guide you to purchasing the best glasses for your vision.

The first thing to understand is your prescription. Take a look at the top section - do you see the abbreviations SPH, CYL, and Axis? In short, your SPH stands for sphere and it'll tell you what kind of distance correction you need. Your CYL stands for cylinder and this will tell you what kind of astigmatism correction you need - it works in conjunction with your Axis. If you don't see any numbers under the CYL or Axis, it means one or both of your eyes does not have astigmatism! Your sphere will contain a number with a plus (+) or minus (-) sign. The plus sign tells you that you need magnification to correct your vision while a minus sign tells you need help seeing afar. The numbers may be whole numbers like -2.00 or may contain quarter incremental numbers like +4.25. It's important to take a look at your prescription before you leave the doctor's office to fully understand the numbers and symbols of the prescription. If you choose to order glasses online, it'll help you in the ordering process.

Prescriptions with a plus sign will result in lenses that are thicker in the middle while prescriptions with a minus sign will have lenses that are thicker on the sides of the lens. Why is this important? It's good to know where the thickness will lie when picking out lenses. If you're opting for thinner lenses - your prescription will help indicate which high index lens would be best for you! If your prescription lies within the range of -2.00 to +2.00, you should be fine with the basic CR39 lens; a high index lens of 1.56 is typically 25 percent thinner than basic plastic lenses and can work with prescriptions ranging from -4.00 to +2.00; if your prescription ranges from -6.00 to +4.00, opt for the high index 1.61 lens that is 30-50 percent thinner than regular plastic lenses.

For high prescriptions like -8.00 to +4.00, high index 1.67 lenses are perfect but for prescriptions higher than this, like those that range -12.00 to +4.00, the thinnest lens you can get is 1.74 high index. It's important to remember that the higher your prescription in plus or minus, the thicker your lenses will be - even with high index lenses. The thinner your lenses are, the more important it is for you to get a UV protective coating.

Once you fully understand what kind of eye glasses you need for your vision, the easier it will be for you to choose a set of lenses. Remember to take your eyeglasses prescription with you when you leave your doctor's office and always ask questions before leaving!

Hillary Glaser is a social networking specialist and expert in cross-media promotion, currently working on promoting prescription eyeglasses. She is the Director of Marketing and Special Projects for GlassesUSA.com - the easiest way to buy glasses online, which now offers free shipping on all US orders with the code FreeShip10.