All posts by repair_eyewear

Presbyopia: Symptoms & Solutions

Have you gone your whole life without ever needing to wear eyeglasses or contact lenses but are now experiencing problems reading small print or focusing on nearby objects? Do you find yourself having to stretch your arms in front of your face to read your morning newspaper? Is it hard for you to read a menu in a restaurant with dim lighting? These symptoms can be aggravating and maybe even a little bit frightening, but don’t fret too much because you are not alone.

Presbyopia is commonly corrected with bifocal eyeglasses.

The technical term for this condition is called presbyopia. Presbyopia, like wrinkles and gray hair, is thought to be caused by aging. In fact, the word presbyopia originates from the Greek word presbys, which means “elder” and the ancient Greek word ops, meaning “eye.” While the exact mechanisms that cause presbyopia are not yet fully understood, doctors and scientists believe that it is caused by the loss of elasticity of the eye’s crystalline lens. Changes in the lens’ curvature, which are caused by the continued growth and weakening of the muscle that bends and straightens the lens, have also been looked at as a major cause.

The initial signs of presbyopia include: difficulty seeing or reading in dim or low lighting, eyestrain and headaches when reading for long periods of time, problems focusing on and / or reading small print, and experiencing blurred vision when transitioning between different viewing distances, such as from the television to a book or newspaper. Most people begin to notice these symptoms between the ages of forty and fifty, but they can be felt even sooner.

It is extremely important to pay attention to any vision changes you may be experiencing. While it can be easy to brush your symptoms off as just “getting old,” having specific information about your vision problems can help your optometrist work up a diagnosis and find a solution to them. There are, in fact, a variety of different ways to treat presbyopia, even for people who prefer to wear contact lenses.

Corrective eyeglasses are the easiest way to battle the effects of presbyopia. Bifocal and multifocal eyeglass lenses are popular among people with presbyopia because they eliminate the need for an additional pair of reading glasses on top of the glasses people may need to correct other vision problems, such as near-sightedness. Technology has made it possible for eyeglasses to accommodate two or more prescriptions on one lens, and the lenses can be made without the distracting lines. These are known as progressive lenses. You can also purchase over the counter reading glasses if you do not have any additional vision problems for which you need corrective lenses.

Acuvue Oasys for Presbyopia Contact Lenses are contacts specifically made for those with Presbyopia.

You may be one of the millions of people with presbyopia and an additional vision issue who prefers to wear contact lenses. Lucky for you, there are many brands of contact lenses that accommodate multiple prescriptions. These special bifocal and multifocal contact lenses are made with two or more prescriptions in each lens. Contact lenses for presbyopia are available in either “alternating vision” or “simultaneous vision” designs. The alternating, or translating, lenses are made with a split-lens design, which means there is a separation between the two prescriptions that has an obvious line between the top and bottom of the lens. The simultaneous lenses require your eye to look through both prescriptions at the same time. Your eye is able to select the correct power for the given situation.

It is natural to be worried when you start to notice that your eyesight isn’t what it used to be, but you can rest easy knowing that this natural change in your vision can be pretty easy to correct. Make sure to pay attention to your vision changes, and make an appointment with your optometrist to go over your concerns, update your prescriptions, and discuss your options.

Once you have your new prescription you can visit to shop for eyeglasses and contact lenses that will accommodate your needs.

How The Laser eyewear repair Welding System Works

One of the key elements in making laser welding applicable to eyewear repair was the development of the “free-moving” concept.  In this approach, the laser welder generates a stationary infrared light pulse which is targeted through the microscope’s cross-hair. The laser pulse can be controlled in size and intensity.  Because the heat generated remains localized, operators can handle or fixture items with their fingers, laser welding small areas with pin-point accuracy without causing any harm to the operator’s fingers or hands.  This free-moving concept enables users to eliminate costly fixturing devices and increase the range of assembly and repair applications.

In laser welding systems, the operator controls the beam diameter (weld spot), power level (voltage) and pulse length depending on the type of alloy and joint being welded.  A stereo-microscope with internal cross-hairs make it easy for the operator to align and weld the component part or assembly at the precise location. The laser welding pulse is then activated with a foot pedal.  Many laser welding systems also offer the option of a cover gas, normally Argon, to ensure a homogeneous laser weld while preventing any discoloration or contamination.

Most operators can learn to use laser welding machines in a few hours. Although, to become fully proficient and benefit from the machine’s full potential, users must have a good understanding of the metallurgical properties of the alloys being welded.  An experienced laser welding technician can typically perform basic manipulation of the repair item within minutes. However, laser welding training is always a good idea to learn more advanced skill sets.

Laser spot welders pose little hazard to operator’s fingers or hands while in the welding chamber.  Occasionally, an operator’s fingers may experience a deflected laser pulse, but little damage is done. It is similar to a pin-prick or touching something hot.  To ensure the safety of your laser welding system, always ask the manufacturer before you purchase if the machine is FDA certified according to the safety standards established by the Laser Institute of America.

Since most manual laser welders range in pulse energy from 40-150 joules of energy, or 30-50 Watts, they are normally categorized as a Class 4 laser device, the highest-powered Nd:YAG laser available.  When the laser welding chamber is fully enclosed, the laser welding system meets the Class 1 safety standards, which is the safest laser to operate.