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All About Vision

Orthokeratology CRT & VST


Imagine freedom from daytime eyewear! Orthokeratology, best known as Ortho-K, are contact lenses which are only worn at night while you sleep, so that you don't need contacts or eyeglasses during the day.

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What is Ortho-K?

Orthokeratology, commonly called ortho-k, is a method used to correct myopia (nearsightedness) or astigmatism by wearing rigid gas permeable contact lenses overnight, so that no corrective lenses are needed during daytime hours.

Gas permeable (GP) lenses specialized for ortho-k are inserted at bedtime and worn as you sleep. Throughout the night, the lenses reshape your cornea gently so that your vision becomes clear on the following morning. The correction is temporary, and ideally no eyeglasses or contact lenses will be needed on the next day or two. In order to maintain sharp visual acuity on a daily basis, you need to wear the ortho-k reshaping lenses every night.

At present, three brands of orthokeratology contact lenses are approved for use by the FDA. Euclid Emerald, usually prescribed for myopia control, Paragon Vision Sciences, who produces “Corneal Refractive Therapy” (CRT), and Bausch and Lomb, who manufactures “Vision Shaping Treatment” (VST).

Best Candidates for Ortho-K

Ortho-k is very suitable for nearsighted people who are not appropriate candidates for vision correction surgery, such as children. Individuals of all ages with healthy eyes can try ortho-k, namely because it can be discontinued at any point without permanent effects to the eyes.

People who require vision correction and engage regularly in sports or work in extremely dusty, dirty environments will also appreciate the convenience of ortho-k.

How Does Ortho-k Feel?

Although some people have trouble wearing regular gas permeable contact lenses during the day, ortho-k GP lenses are worn while sleeping – so discomfort and awareness of the lenses in your eyes is generally not an issue.

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Vision Results from Orthokeratology

Success rates for ortho-k are generally higher for more mild vision prescriptions. The ideal goal is to provide 20/20 vision without any need for eyeglasses or contacts during the day.

According to FDA trials conducted on both CRT and VST lenses, more than 65% of ortho-k patients achieved 20/20 visual acuity. A whopping number of more than 90% of ortho-k patients achieved 20/40 vision or better (this is the legal requirement for driving without vision correction in most states). Consult with your eye doctor to find out if your vision prescription is within range for successful ortho-k treatment.

Note that although improvement in vision is generally reported within a day or two of wearing ortho-k overnight, the full effects may not be experienced until the lenses are worn for a few weeks. During this transition period, your vision will probably not be as crisp as it was with regular contacts or eyeglasses, and glare or halos around lights may be visible. Until ortho-k works fully, a temporary pair of eyeglasses may be required for specific actions, such as driving at night.

Is Ortho-k expensive?

Professional fitting for ortho-k requires a series of visits to your eye doctor. A number of pairs of contact lenses are also generally needed. GP lenses that are special for ortho-k are more costly than standard contacts. In sum, the fees for ortho-k add up to a higher total than regular contact lenses.

LASIK after Ortho-k

Some consider Ortho-K to be a non-surgical alternative to LASIK. Nonetheless, refractive surgeries, such as LASIK, are possible after treatment with ortho-k lenses. Yet because ortho-k works to reshape your cornea, you are required to stop wearing the lenses for approximately several months before undergoing LASIK. This allows your eyes to return to their original shape.

It’s important to inform your LASIK surgeon if you’ve been wearing ortho-k lenses, and you will be advised as to how long of a wait is necessary before having the laser procedure.

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Performance and Sport Sunglasses


Whether you are out in the fields, the golf course, the waves or the mountains, no matter where you are, you want your sunglasses to protect your eyes from the sun and enhance your visual experience.

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More than Sun Protection

Sports and performance sunglasses are more than sun protection, they need to be designed for optimal, fit, comfort, acuity and strength, based on the demands of the sport or leisure activity you pursue.

Each element of your sports eyewear needs to be designed for active wear and to stand up to the tests of extreme weather conditions, rough play, impact and of course the sun. If you are fishing for example, you need anti-glare protection in your lenses for when the sun’s bright rays reflect off the water, you need a broad frame to keep out the mist and wind and you need strong frames and lenses for impact resistance.

Most importantly, depending on your sport of choice, your glasses should assist in creating an enhanced visual experience so you can see and perform at your best.

Performance Sport Lenses

The first consideration when selecting your sports eyewear is the lens. You likely want a lightweight, strong and durable lens that can withstand impact from debris, other athletes, balls or falls. The leading lenses in this arena are polycarbonate or trivex lenses which are made from highly impact resistant plastic that has built-in UV protection.

Glare can be an annoying and uncomfortable distraction in outdoor activities, which can reduce vision and have a negative impact on sports performance. Polarized lenses will help to reduce the glare that is reflected off of wet, icy or shiny surfaces.

Lens tints and coatings (such as anti-glare or anti-scratch coatings) can also help to improve visual clarity and can serve to reduce glare and to enhance contrast sensitivity to improve vision and therefore performance in certain outdoor activities. Some sports sunglasses come with interchangeable lenses of different tints to allow you to choose the contrast that most suits the conditions you are playing in.

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Sport Frames

When selecting sports sunglass frames, the most important consideration is whether they have a comfortable and secure fit. Look for a pair that is strong and durable, yet lightweight and that doesn’t press into your face and cause discomfort at the temples or the bridge of the nose.

For some sports like snowboarding, sports goggles might be the best option for the weather conditions and specific nature of the movement. Some frame options come with grips on the nose pads or temples to avoid slippage, particularly when you perspire.

Sports sunglasses are available in a variety of styles, shapes and sizes and the type that is best for you largely depends on the activities you participate in and what they demand. It is best to consult with your eye doctor or optician to get a full picture of your eye, vision and athletic needs in order to find the best pair of sports sunglasses for you.

Eyeglass Frame Materials


Eyeglass frames are made from a vast array of different materials, colors, and ranging in prices and specialty features. We know this can be a bit overwhelming so below you will find a basic guide explaining the most common types of frames and their benefits.

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Which Type of Frames Should I Choose?

It’s time to choose a new pair of eyeglasses, and the current selection of frames is overwhelming. Armed with only your vision prescription, you now need to navigate between different materials, colors, prices and unique features of all the eyeglass frames.

Your lifestyle plays a big role when considering the best material for your eyeglass frames. Children, teenagers, and anyone with an active lifestyle require durable and flexible frames that are able to withstand hits and falls.

As well, anyone with skin allergies must make sure their frame materials are hypoallergenic, such as titanium, acetate, or stainless steel.

Other specialty materials designers are using are wood, precious gems, bone and even leaves. Here is a basic guide that explains about the most common types of frames and what they have to offer.

Metal Frames

The most popular material for eyeglass frames, there is a whole array of metals to consider. Each metal comes with a distinctive set of properties and characteristics.

Titanium

Extremely resilient and corrosion-resistant, titanium is also hypoallergenic and weighs in at 40% lighter than other metals. Available in a variety of color tones, titanium is an ideal material for eyeglasses.

Beta titanium

Titanium mixed with small quantities of aluminum and vanadium, this alloy is more flexible than pure titanium. Adjustments to your eyeglass fit are therefore done easily.

Memory metal

Frames made of memory metal are composed of a titanium alloy that has approximately 50% nickel and 50% titanium. These eyeglasses are very bendable and will return to their original shape even after they are twisted and turned. Memory metal frames are superb for kids or anyone who is rough on their eyeglasses.

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Metal Frames Continued...

Beryllium

The primary advantage of beryllium is its corrosion-resistance. A less costly metal than titanium, beryllium doesn’t tarnish. It is an ideal option for anyone who spends a lot of time around salt water, or who possesses high skin acidity. Flexible, durable and lightweight, beryllium comes in a range of colors.

Stainless steel

Manufactured in both matte and polished, glossy finishes, stainless steel is strong, flexible, corrosion-resistant and lightweight. An iron-carbon alloy, it also contains chromium.

Monel

This popular alloy of copper and nickel is less expensive than other metals, yet depending upon the quality of plating used – it sometimes discolors or causes skin reactions after long use.

Aluminum

Lightweight and very resistant to corrosion, aluminum boasts a unique look and is frequently used in high-end, exclusive eyewear.

Plastic Frames

Zyl

Abbreviated from “zylonate” (cellulose acetate), zyl is relatively inexpensive and very popular in plastic eyeglass frames. Lightweight, it is available in a rainbow of colors, including multi-colored versions and layers of different colors within one frame.

Propionate

Often used in sports frames, propionate is extremely durable and flexible. This nylon-based plastic is also lightweight and hypoallergenic.

Nylon

Over recent years, nylon has been replaced largely by more resilient nylon blends, such as polyamides, gliamides and copolyamides. While 100% nylon is lightweight and strong, it tends to weaken with age and become brittle.

Cellulose acetate

A plant-based plastic that is hypoallergenic. This material was first used for eyewear in the late 1940’s because of brittleness and other problems with previously used plastics. Today’s acetates are known for being strong, lightweight, and flexible. Cellulose acetate also has the widest range for transparency, rich colors, and finishes. More complex colorations are able to be produced by layering several colors or transparencies in layers and sandwiching them together.

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Combination Frames

The best of both worlds, combination frames offer metal and plastic components in one frame. These styles were trendy in the 1950s and 1960s and have recently been revitalized for a fun comeback in many more colors and tones than the classic versions.

Mix It Up!

Each respective frame material brings unique features and advantages to your eyeglasses. One pair of glasses may not fit every part of your daily routine, in addition to social outings and special occasions.

Perhaps a pair of titanium frames is best for your sophisticated, conservative work environment, but on the weekends you’d prefer to show off style with a retro zyl frame in laminated colors?

Consider purchasing more than one pair of eyeglasses, and match your frames to your personality and lifestyle.

Dr. Alan Schlussel