Contact Lenses Eyeglasses

Low Vision, also referred to as poor vision, is when a person loses their sight which is not completely restored using such aids as surgery and prescription eyeglasses. Such sight loss can include poor night vision, blind spots, and a glare preventing one from seeing clearly. Total blindness is not considered low vision because there is still some sight with low vision. Low vision is normally associated with people who are “legally blind” and require vision aids.

The American Optometric Association classifies low vision in two categories:

Partially Sighted: Visual acuity is between 20/70 and 20/200 with conventional prescription lenses.

Legally Blind: Visual acuity no better than 20/200 with conventional correction and/or a restricted field of vision less than 20 degrees wide.

The World Health Organization classifies visual impairment as:

-    20/30 to 20/60:  Mild vision loss, or near-normal vision
-    20/70 to 20/160: Moderate visual impairment, or moderate low vision
-    20/200 to 20/400: Severe visual impairment, or severe low vision
-    20/500 to 20/1,000: Profound visual impairment, or profound low vision
-    less than 20/1,000:  Near-total visual impairment, or near total blindness

Low vision can result from a number of conditions that can include inherited diseases, birth defects, macular degeneration, glaucoma, cataracts, and physical injuries. It can also result from such circumstances as diabetes, cancer of the eye, albinism, or a brain injury. Eye care specialists can diagnose low vision by using lighting, magnifiers, and visual testing charts. Low vision is often seen in adults over 45, especially the elderly.

The most common types of low vision include:

-    Central Vision Loss: A blind spot in the center of a person’s vision.
-    Peripheral Vision Loss:  Cannot see on either side, above or below eye level.
-    Night Blindness: Problems seeing in poorly lit areas.
-    Blurred Vision: Objects both near and far are blurry. For instance, refractive error is an eye disease where the shape of the eye does not bend light properly, resulting in a blurry image. Common refractive conditions include myopia (short sight) hypermetropia, (long sight) presbyopia, (aging of the lens) and astigmatism (irregular curvature of the lens.)
-    Hazy Vision:  Vision appears to be covered with a film or glare.

Sign that may suggest low vision include:

-    Not recognizing faces
-    Performing activities where you find yourself looking closely such as when reading, watching television, or sewing.
-    Picking out the wrong clothing colors.
-    Turning on bright lights to see well.
-    Unable to read street signs

Low vision can often be treated using such aids as hand magnifiers, lenses that filter light, reading prisms, magnifying glasses, telescopic glasses, and closed-circuit television.
Non medical aids that can help a person with low vision include talking watches and clocks, text reading software, large print books and magazines, clocks, phones, and watches that have larger numbers, etc.

Due to technological developments in the field of low vision rehabilitation, today most people suffering from low vision can be helped to improve the quality of their lives. Visual aids improve both sight and the quality of life for many people. If you are having problems with your sight, see an eye doctor for testing.

Whether you are a new contact lens wearer or you have been using them for years to correct your vision, you may be wondering how can you tell if a contact lens is inside out. If you suspect you may be wearing your contact lenses incorrectly or they just feel uncomfortable, here are some ways you can determine this to avoid the problem in the future.

Look at the Lens

Before placing the lens in your eye, hold it on the tip of your index finger and look at it carefully from the side. Is it shaped like the letter “U” or it is flared on the sides, like a soup bowl? The correct shape of a soft contact lens should be like the letter “U”. If it’s shaped like a soup bowl, then it’s inside out. Some people also recommend the “taco test” whereby you gently squeeze the lens so that the edges touch. If they touch completely, then the lens is right side out. If the edges flare out and don’t touch fully, then it’s inside out. Simply flip the lens around and it will be positioned correctly for wearing.

Another way to determine if your contact lens is right side out is to look at it from the top. This is especially important if you are wearing the colored enhanced type. The edge of a tinted lens will be look very blue. If it looks greenish, then it is inverted and you should carefully flip the lens around in order to wear it properly.

Find the Engraving

Some contact lenses have factory engraving on them, done by special lasers. This can include the manufacturer information, model number, brand name or grade of materials used. While this is not detected by the human eye when wearing, it can be of help when trying to determine if you are wearing your contact lenses correctly. Some brands have a “1-2-3″ engraved on them, so you would make sure this is the side facing downwards on your finger as you place the contact into your eye. If you can read this label, then the lens is inside out. You can remove it safely without damaging your eyes and flip it around for replacement.

Ask the Professional

Of course, please check with your eye doctor if you experience any discomfort with your contact lenses. They can often help you more with this perplexing problem or demonstrate to you further what to do. Common sense should tell you if you are wearing your contact lens incorrectly. If they feel uncomfortable or you feel slight pressure on your eyes, it’s probably because you have placed the lenses incorrectly on your eyes. You may want to practice a little when first getting a new set of contact lenses to see what works best for you and to get used to the feel of them. Once you do, you should enjoy months of enjoyable experience with your new lenses.

Many, many people across the country and across the globe need some sort of vision correction in order to be able to see well enough to perform even some of life’s most basic functions. Things like reading a newspaper or deciphering the symbols on a traffic sign would be almost impossible for some people without the help of corrective lenses – what’s surprising though is that with all of the people who have an inherent need for corrective lenses, very few actually know how their prescription glasses are actually put together.

Making corrective lenses actually begins at the point of the eye exam, a person is examined by an eye care professional to determine what their prescription is – and then that information is sent off to a lab. Once the numbers are in the technician’s hand, he or she will determine what type of prescription blank is closest to the corrective requirements. The prescription blanks are preformed lenses that are flat on one side and curved on the other and most commonly made of impact resistant plastic. The thickness of the blank selected will be determined by the corrective needs of the individual patient. The prescription lens blank is expertly ground done by the technician until it will provide the corrective properties that are needed by the wearer.

Once the appropriate curvature for the prescription has been reached, the edges of the lens are then ground down to fit the frames that were pre chosen by the patient. It’s at this point in the process that the lenses will be specialized if necessary with things like tinting or UV protection.

Then lenses need to fit securely into the chosen frames so it often necessary to heat them in order to make them pliable before insertion into the frames occurs. Once the lenses are securely installed into the frames it’s time for everything to be cleaned up, packaged and shipped out to your eye care professional for you to pick up.

Though the process doesn’t sound incredibly difficult, it is a very exact science – even a minor error on the part of the technician could render the glasses useless to the patient, so the utmost care and precision must be exacted with every single lens that goes into the grinding machine.

Once you get your eyeglasses, you must exact great care in making sure that they don’t become damaged. Some frames are made to handle abuse, they are flexible and can almost bounce back from instances that would have destroyed and older set of frames – even though the technology with lenses has come a long way they still aren’t capable of holding up well to excessive abuse. If your lenses get scraped up or heavily scratched, it could be back to square one, prescription lenses can’t be ground down to remove marring because that would end up changing the prescription of the lenses and therefore effect the vision of the owner.

If you exercise the caution that you should when wearing your prescription glasses, damaging them shouldn’t be a very big concern but if you are careless in either the handling or cleaning of your prescription lenses you may find that you need a new pair much sooner than would normally be necessary. Prescription glasses can be costly because of the work that goes into producing them properly, most people can’t afford to be replacing a pair of prescription glasses more frequently than is necessary as a result in a change to their prescription. So think about all the care and hard work that goes into crafting your prescription glasses before you do any undue damage to them through improper handling.

The difficulty of having to work out the way to accurately measure for glasses on your own is a comparatively new one. Today ordering glasses can be done over the Net with no visit to the optician needed, but to make sure that your new glasses will fit and cause you no issues you have got to know the way to measure for the frame accurately.

When measuring for glasses, the most vital piece of info to have is the PD, or the space between the wearer’s pupils.

This measurement is vital in the right fit of glasses because even if it is off by some millimeters the wearer can suffer some sick effects. It is possible to take this measurement on your own if you can not, for one reason or another have your glasses professionally fitted. Measure the distance from the middle of one pupil to the middle of the other whilst looking without delay ahead. If you know your prescription and have a correct measurement of your PD, it is definitely possible to get a good fitting pair of glasses with no need to take the trip to an optician. Going to an eye care professional for a glasses fitting also has some other advantages outside the correct measurement and general check up.

At the optician you can touch, hold and try on frames, lots of them if you so select, before making any last calls. Even if you do not have somebody to take with you to help decide on new frames, that’s what opticians do for a job - they are going to be happy to advocate certain frames that may flatter your face and go well with your personal features.

One of the more pressing queries re how contact lenses work is how they manage to remain on the eye. With soft contacts, the flexible material of the lens folds softly over the rounded cornea. The same process happens with hard contacts only the particular contact with the cornea isn’t as close or as sealed as with hydrogels. Once seated over the cornea our own natural teas and blinking motions helps keep the lens in effect. Tears and blinking also keep common each day objects like dust and particles from landing on the contacts themselves.

With repeated cleaning thru lens express eye drops, wear should be snug all day 24×7. Toric contact lenses work by staying seated in the eye as opposed to moving around like ordinary lenses do. It is also a little heavier at the “bottom” than other contact lenses so the prescriptions align completely every time.

This in turn helps correct the form of the cornea which is off a bit in folk with astigmatism. The lens has 2 prescriptions in it ( to heal near or farsightedness ). Farsighted folks will get a lens that is thicker in the middle and thinner on the outer edges. Since vision has a lot to do with the way the outer and inner workings of the eye replies to light, this is crucial. That is why it is urgent to follow the direction of usage when you wear contacts.

As an example, everyday wear contacts would possibly not be as sturdy as weekly or monthly ones. Make sure you follow the instructions and you may always get the full benefits that come from wearing contact lenses.

Once determining what’s wanted to correct your vision the doctor will allot a prescription to you that might or might not change over time.

This is the reason why yearly examinations are required, particularly since sight degradation can be halted or maybe reversed with routine care. Contact lenses are fantastic creations and the way they’re employed would possibly not be as crucial as how we implement them in our daily lives. When it comes to understanding the issues related to your vision issues however, self diagnosis isn’t a choice. There are a few major eye disorders that are mimicked by more harmless ones. Hence why it’s very important to make sure you have an annual checkup to ensure you always protect your eyes.

Your prescription glasses may look as beautiful as the day you got them, but if your nose pads have begun to yellow, or better yet build up green gunk underneath, they become unsightly when people get close to you. What can you do about this problem? Is there anything you can do to clean yellowed nose pads on your glasses?

Why Nose Pads Turn Yellow

Nose pads are made out of clear plastic. They are in constant contact with your skin, and underneath the plastic the skin often sweats. The sweat, over time, causes the nose pads to turn yellow. On average it takes about one year for the nose pads on your glasses to turn yellow, and you probably want your glasses to last longer than a year, particularly if you are paying a lot for designer eyeglass frames.

Additionally, the reaction between the acidity of the sweat and the metal of the frames can lead to a greenish buildup on the nose pads. This buildup also contains dirt and grime from your skin. It is unsightly, and also quite unsanitary if you stop to think about it.

Can It Be Cleaned?

The answer to whether or not nose pads can be cleaned is yes and no. You cannot do much for yellowed nose pads. Unfortunately, once the nose pad has turned yellow, it is permanent. However, the green gunk and grime under the nose pad can be cleaned.

One way to do this is to use a pre moistened alcohol pad. Shove the alcohol pad between the nose pad and the frame, and let some of the alcohol leak onto the nose pads. Then, rinse it off with water.

If this does not work, use a soft-bristled toothbrush, preferably a child-sized one, and scrub the nose pads. You can even remove them if you wish to get them really clean, but make sure you keep careful tabs on the screws if you do, because they are tiny.

Some people who wear eyeglasses claim that soaking them for an hour in soapy water and then rinsing them will remove the gunk that builds up under the nose pads. Again, this will not help with the yellowed plastic, but if you have buildup it is worth a try.

Consider the Alternative

If you have yellowed nose pads, you do have another alternative. Replacing the nose pads is actually quite affordable. You can pick up a nose pad repair kit at a drug store or your local optometrist, but make sure you have your glasses with you, as there are different kinds available and you will need the right ones.

To do the replacement, start by laying out your supplies on a light colored towel. This will keep the tiny pieces from sliding off of the table. Then, use a jeweler’s screwdriver to remove the old nose pads. Once they are off, use alcohol soaked pads to clean the frames near where they connect to the nose pads. You want all residue removed before you put the new pads on.

Once the glasses are clean, install the new pads using the jeweler’s screwdriver. Do so gently, as it is very easy to damage these delicate pieces. If you feel resistance when you try to screw in the new screw, take it out and start again.

When you are done, place some clear nail polish or white glue on the screw heads. This way they will not eventually slip out, but you can remove them with your screwdriver if you need to later. Do not use strong glues, as this will make it difficult to remove the nose pads when they also turn yellow. When you are done, you will have glasses that look as good as they did the day you bought them, and you will pay very little for the revamped look.

No matter how careful you are with your glasses, you are probably going to deal with a scratch or two over their lifetime. While some scratches may not bother you, as they are out of your line of sight, others create problems with your vision when they are directly where you need to look. If you are suffering from scratched lenses, you may be able to remove them with just items you have around your own home.

Plastic Versus Glass

One variable to consider when looking for a scratch repair option is whether your glasses are glass or plastic. Many of today’s lenses are made out of metal plastics, such as polycarbonate, in order to reduce the risk of breaking. These lenses also weigh far less than traditional glass lenses. Many of the scratch repair options work only on plastic lenses, so if you have glass ones you are going to struggle to repair the scratch.

For instance, many solutions you can buy to repair scratched glasses are polymer-based solutions. Polymers and plastics are both made from carbon, so when you bring them together they bond with one another, and this can effectively fill in a crack. These do not work well on glass at all. In fact, the only likely option you will find to repair a glass lens that has been scratched is to have it professionally restored, and the price of purchasing a new lens for your frames is typically more affordable.

The Toothpaste Method

One way to remove scratches from plastic designer lenses is to use toothpaste and a soft, non-abrasive cloth. Get a regular toothpaste, not one with whitening and other fancy aspects to it, and then rub it on the lens in small circles using the soft cloth. Spend about 10 seconds rubbing the toothpaste on the scratched lens. Then, use water and a new soft cloth to remove the toothpaste.

This does not always work the first time. If you still notice the scratch, repeat the process again. Keep in mind that glasses that have a coating on them will be harder to treat in this manner. You will have to use the toothpaste to rub off all of the coating, so you may wish to bypass this option on your next pair of glasses, as they also will likely get scratched.

Using Jeweler’s Rouge

Jeweler’s rouge is another product you might be able to use to remove scratches from your glasses. Choose a low abrasive jewelers rouge. Then, make a mix using two ounces of ammonia and two quarts of water. This is more of the mixture than you will need, but these measurements ensure that you get the right ratio. Use a polishing cloth to first apply the jeweler’s rouge to the scratch in a circular motion. Buff the glasses for a while until the scratch becomes less visible. Then, don some protective glasses and rubber gloves, and use the ammonia mixture to clean the glass using a soft sponge. When you are done, dry the lens completely using a lint-free, scratch-free cloth.

Final Considerations

While your designer glasses may have been expensive, part of this expense goes towards the purchase of the frames and having the glasses fitted. You may find that simply replacing the scratched lens is more affordable than you think.

If you attempt to use any of these methods to repair your scratched lens, you need to know that they could end up damaging your lens if you do them improperly, so do so at your own risk. Often lenses are coated for various reasons, including glare reduction and scratch protection, and attempting to fix a scratch will almost always damage this coating. However, if the cost of replacing your lens is out of reach, you may wish to try to repair the scratch yourself, but understand the risk if you do.