Focus on Eyecare

NO-LINE BIFOCALS

If you need glasses for distance viewing and reading, as well as any distance in between, you might want to have a look at “progressive lenses.” These lenses have the advantage of not having a telltale line between prescriptions as do bifocals. If necessary, a third prescription can be introduced in between for middle distance, creating trifocals. Without any line between prescriptive strengths, progressives provide smooth, continuous vision at near, middle, and distant focal ranges, with no unsettling image jumps. As a result, corrected vision provides more natural vision than bifocals or trifocals. While progressive lenses may require a period of adjustment, wearers often find that their utility and cosmetic appeal make an unbeatable combination. While eyeglass lenses are prescribed to correct all kinds of vision problems, prescription lenses have come a long way—offering you the opportunity to truly customize your eyeglasses and make a statement about how you choose to look at the world.

P.S. “Presbyopia” (the loss of focusing power

associated with middle age) is responsible for the need

for reading glasses.

WHAT DETERMINES EYE COLOR?

            Even though our irises can range in color from dark to light brown, green, hazel, gray, and blue, there are actually only two different pigments in our eyes, brown and red. The iris, composed of connective tissue and a thin muscle that allows it to open and close in response to light, contains cells (melanocytes) that can make two different types of pigment, brown-black “eumelanin” and red “pheomelanin.” While dark eyes have the most pigment (particularly brown-black eumelanin), light blue eyes have the least amount of pigment; however, there is no blue pigment. Blue eyes occur when the white collagen fibers in the connective tissue in the iris scatter light in a way that makes the iris look blue.

P.S. Eye colors between dark brown and light blue have varying amounts of pigment and areas without any pigment, which leads to the unique colors of green, hazel, and gray.

 

UNEVEN CURVATURE

            While it’s easy to understand that a “nearsighted” eye’s refractive error happens when it is too long (from front to back) and a “farsighted” eye is too short, “astigmatism” is less well understood. This type of refractive error occurs when the eye does not focus evenly. Instead of being perfectly round, an astigmatic eye is not evenly curved in all directions. This subtle difference in curvature tends to blur the images and makes them seem to be stretched out. For instance, when an astigmatic eye looks at a vehicle’s taillight, it will seem to throw off streams of light. An astigmatic prescription creates complementary curvature in the corrective lens that allows light to focus evenly on the retina.

                       

P.S. An astigmatic cornea is shaped more like a football than a basketball.

EYEGLASS MAKEOVER

            If you have been wearing the same pair of eyeglass frames every day for longer than you can remember (much in the way that some people have not changed their hairstyle for a decade or more), look upon a new pair of frames as a way to enhance or change your appearance. A new pair of glasses has the potential to change the way that people look at you, and even change the way that you look at yourself. Try opting for tortoise shell frames for a slightly more conservative and academic appearance at work, then choose frames with a more casual image for leisure time. Frames are every bit as able to fit the moment as fit the face.

P.S. Fashion eyeglasses provide one of the easiest ways to give yourself an image overhaul.

 

SPORT BIFOCALS

            Anyone over age 55 probably already owns a pair of reading glasses, while those who wear prescription eyeglasses also likely own a pair of bifocals or progressive lenses. Those who spend a lot of time outdoors  may also want to invest in a pair of sunglasses that not only enable them to see at a distance, but also allow them to see up close. Combine these needs with the glare coming off water, sand, or snow, and you have the ingredients for sunglasses with polarized bifocal or progressive lenses. By relegating the reading segment of the glasses as far down as possible on the lenses, these lenses allow active individuals to comfortably set their eyes on the task at hand.

P.S. Whatever sport glasses you purchase, be sure to choose shatter-poof lenses (polycarbonate or Trivex) that will not compromise safety.