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Some of these are strictly cosmetic, but depending on your vision needs, others may “potentially improve your comfort and safety,” says Andrew Iwach, MD, clinical spokesperson for the American Academy of Ophthalmology (AAO).

Their ability to function is because they have been constructed with special components that enable them to achieve high magnification levels. They can view very small specimens and distinguish their structural differences, for example, the view of animal and plant cells viewing microscopic bacterial cells.

No matter what your warranty says, if a coating starts to degrade within a year, Vitale recommends taking the glasses back to see whether you can get the problem fixed or the glasses replaced.

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Avoid the hard sell. Even if you’re buying the glasses from your ophthalmologist, “by the time you get to the eyeglass purchase point in the eye exam cycle, you’re in a retail environment and may be working with the staff, rather than the doctor,” Vitale says.

But once you’ve picked frames and lenses, there’s a wide variety of lens coatings to consider, each with its own properties—from light reduction to scratch resistance.

Ans. The eyepiece, also known as the ocular is the part used to look through the microscope. Its found at the top of the microscope. Its standard magnification is 10x with an optional eyepiece having magnifications from 5X – 30X. Objective Lens are the major lenses used for specimen visualization. They have a magnification power of 40x-100x. There are about 1- 4 objective lenses placed on one microscope, in that some are rare facing and others face forward.

Put price in perspective. Some types of coating, like those that are anti-reflective (sometimes called glare-reducing), come in a range of prices. But experts say the most expensive option offered isn’t necessarily of significantly higher quality. “I know some ‘house brands’ out there that are pretty similar to the premium versions,” says master optician Michael Vitale, vice president of membership and technical affairs at The Vision Council.

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Microscopes are instruments that are used in science laboratories to visualize very minute objects, such as cells and microorganisms, giving a contrasting image that is magnified.

And while some coatings may be included in your eyeglass package price, others may add as much as $100-plus to your bill.

The optical parts of the microscope are used to view, magnify, and produce an image from a specimen placed on a slide. These parts include:

Here, dyes are applied to lenses to cut down on the visible light (but not necessarily UV rays) entering the eye. Hues range from light tints like a pastel blue or pink to deeper shades used for sunglasses.

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As for blue blockers, “there’s probably no harm, though anything that limits the light reaching you can lessen your vision,” Iwach says. “But the benefits have not been proven.” He has also recently seen an increase in interest in yellow-tinted lenses for night driving but cautions that these “can actually complicate things, since in low-light conditions, you want to get the most light in that you can.”

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What to know: “Everything on the market now except your most basic standard plastic CR-39 lens [which still made up about 36 percent of the prescription lenses sold in the U.S. in 2019, according to the Vision Council] is probably going to come with scratch-resistant coating already on it,” Vitale says. “And that’s because CR-39 is already pretty scratch-resistant.” To further help keep lenses scratch-free, store your glasses in a case when you’re not wearing them and use a microfiber nonscratch cloth to clean them.

Ans. Rack stop is included in the microscope for preventing the specimen slide from coming too far up and hitting the objective lens.

Typically applied on both sides of an eyeglass lens, this coating, also known as AR or anti-glare, “reduces the amount of light reflected off the surfaces of spectacle lenses, and may enhance the contrast of certain scenes,” says Scott E. Brodie, MD, PhD, professor of ophthalmology at NYU Langone Health in New York City. This means you’re getting the maximum light from the environment you’re in, but without any visual interference that can occur from that light bouncing off your lenses. (The term “anti-glare” is a misnomer, however, says Brodie, and glare—think oncoming headlights—is better addressed with polarized lenses than with AR.)

Ans. A microscope is an optical instrument with one or more lens systems that are used to get a clear, magnified image of minute objects or structures that can’t be viewed by the naked eye.

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1. Illuminator (Light Source)2. Diaphragm (Iris)3. Condenser4. Condenser Focus Knob5. Rack Stop6. Stage7. Stage Control Knobs8. Nose Piece9. Objective Lens10. Tube (Head)11. Eyepiece (Ocular Lens)12. Diopter Adjustment13. Adjustment Knobs (Fine Adjustment Knob and Coarse Adjustment Knob)14. Arm15. Base16. Light Switch17. Brightness Adjustment

Ans. Condensers are lenses that are used to collect and focus light from the illuminator into the specimen. They are found under the stage next to the diaphragm of the microscope. They play a major role in ensuring clear sharp images are produced with a high magnification of 400X and above. Abbe condenser is a condenser specially designed for high-quality microscopes, which makes the condenser to be movable and allows very high magnification of above 400X. High-quality microscopes normally have a high numerical aperture than objective lenses.

1. Ocular Lens (Eye Piece)2. Diopter Adjustment3. Head4. Nose Piece5. Objective Lens6. Arm (Carrying Handle)7. Mechanical Stage8. Stage Clip9. Aperture10. Diaphragm11. Condenser12. Coarse Adjustment13. Fine Adjustment14. Illuminator (Light Source)15. Stage Controls16. Base17. Brightness Adjustment18. Light Switch

Microscopes are made up of lenses for magnification, each with its own magnification powers. Depending on the type of lens, it will magnify the specimen according to its focal strength.

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Who might consider: People who just like the look, of course. But tints may also help improve contrast for those with degenerative retinal disorders or light sensitivity. “Tinted lenses may reduce discomfort in bright light,” Brodie says. In some cases, even light tints may increase contrast, which can be helpful to pilots and marksmen working in outside light, he says.

Scan the warranty. Many glasses will be backed up by some kind of warranty, but it might not cover coatings. Or warranties may vary in terms of which ones are covered and for how long. What can you expect? “Virtually all coatings today are designed to last the life of the prescription,” says Vitale, which, on average, is about 28 to 30 months.

Ans. The coarse adjustment knob moves the stage up and down to bring the specimen into focus. The fine adjustment knob brings the specimen into sharp focus under low power and is used for all focusing when using high-power lenses.

There are different types of microscopes like light microscope, dark-field microscope, phase contrast microscope, electron microscope, fluorescent microscope, etc.

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Having been constructed in the 16th Century, microscopes have revolutionized science with their ability to magnify small objects such as microbial cells, producing images with definitive structures that are identifiable and characterizable.

The light is then focused on the eyepiece lens. This lens further magnifies the pre-magnified image coming from the objectives.

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What to know: AR may get a bad rap from consumers who remember it being prone to degrading and developing cracks called “crazing” or “spiderwebbing” in its earlier days. But, according to Vitale, such problems were mostly resolved at the beginning of the 2000s. In the past, AR coatings also tended to attract dust and grime, but they now generally include an anti-static treatment that helps repel water and oil and keeps the coating cleaner. “Most of the AR coatings on the market today perform extremely well,” Vitale says.

Ans. The magnification of a lens is defined as the ratio of the height of an image to the height of an object. Microscope magnification measures the total enlargement of the image of an object. Magnification power is the product of eyepiece lens power and objective lens power.

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How do you know what’s right for you? Your eye doctor may have some suggestions. “These are, by and large, personal decisions,” Iwach says. “One size doesn’t fit all.”

Think about how you use eyeglasses. Indoors and outdoors? For sports or only for reading or desk work? Driving day and night? Your lifestyle and habits should inform your coating decisions.

This coating will make your glasses less vulnerable to scratching if you happen to drop them or clean them with an abrasive cloth. “Many glasses wouldn’t last a day without this,” Vitale says. “Polycarbonate and high-index lenses are very soft.”

What you’ll pay: It’s usually included, especially with sunglasses. Otherwise, an upgrade to 100 percent UV protection may be available. At EyeBuyDirect, for instance, it’s included with an upgrade to thinner lenses. And note that polycarbonate lenses, which are natural UV blockers, offer 100 percent protection, as do many high-index lenses, Vitale says.

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Be even more cautious about anything that feels high-pressure if you’re in an eyeglass store, he says. If you feel pressured, Vitale says, “you may want to look elsewhere.”

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To help you sort through the common choices, we’ve gathered advice and cost information from vision experts and major eyeglass retailers, and December 2019 VisionWatch market research from the Vision Council, a nonprofit trade association for the optical industry.

Who might consider: Most people, but AR coating may be especially useful for those who often drive at night (it can reduce reflections from headlights at night) and read on computers. It’s strongly recommended with polycarbonate or high-index lenses, which reflect more light than basic plastic CR-39 or glass lenses.

Ask for an itemized description. In many cases, eyeglass lenses come bundled with certain coatings, commonly those that reduce reflections or bolster scratch resistance. Be sure you don’t pay extra for a coating that’s already supposed to be part of your package.

What to know: The AAO recommends getting 100 percent protection from UVA and UVB rays. Lenses that offer this should be labeled 100 percent UV protection or UV400.

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Over time, exposure to the sun’s ultraviolet rays can lead to vision problems such as cataracts and retinal damage. But many eyeglass lenses have a substantial amount of UV protection built in. You can also sometimes buy an additional treatment to safeguard your eyes fully or opt for lenses with 100 percent protection.

Microscopes are generally made up of structural parts for holding and supporting the microscope and its components and the optical parts that are used for magnification and viewing of the specimen images. Modern microscopes have additional electronics and display devices. This description defines the parts of a microscope and the functions they perform to enable the visualization of specimens.

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What to know: Tinted lenses are often touted as “curing” color blindness, Brodie says. The truth: A tint may make some color contrasts more visible to people with partial color impairment but may make other contrasts harder to see, so it’s a trade-off.

A beam of light is passed through the condenser to the specimen. The light transmitted from the specimen enters the objective lens. While passing through the objectives, the transmitted rays are spread so that they appear to come from the bigger objects.

The types of lenses you choose can make a big difference in the quality of your eyeglasses. Depending on what your eye doctor advises, some people can get along just fine with basic plastic CR-39 lenses, while some may want to consider thinner and pricier polycarbonate or high-index types, which may be more appropriate for stronger prescriptions.

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Lenses tinted yellow are sometimes marketed as “blue blockers” for their supposed ability to reduce exposure to the light emitted by electronics such as smartphones. The theory is that this may ease both eyestrain and any sleep problems associated with using the devices too close to bedtime.

What you’ll pay: Usually included in the price of glasses, but more robust scratch resistance may be built in to some upgraded lens packages.

What you’ll pay: Tints cost an average of $74.67, according to the Vision Council’s VisionWatch market research for December 2019. Blue blocking costs $50 at Warby Parker and starts at $19 at EyeBuyDirect.