Dichroicmirror

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.

Hyperion Optics’s complete range of cost effective dichroic filter range offers superior transmission, reflection and absorption characteristics. Key Features: Sharp transition from reflection to transmission High transmission in pass band Hard coatings and no adhesives for long filter life span All dielectric coated with IBS technology Factory Standard – Contact us for manufacturing limit or custom specifications Angle of Incidence: 45.0° Shortpass Type Transmittance: Tabs>85% Dimensions: 25.2mm*35.6mm*1.1 mm Clear Aperture: >95% Operating Temperature: -45°C ~ 85°C Physical Durability: MIL-C-48497A Longpass Type Transmittance: Tabs>90% Reflection Band: Rabs>98% Thickness Tolerance: ±0.1 mm Transmitted Wavefront: 1/4λRMS@633nm (per inch) Environmental Durability: MIL-STD-810F Substrate: UV Grade Fused Silica Dichroic optical filters consist of thin film dielectric coatings on glass and exhibit sharp transitions between transmitted and reflected wavelengths. Dichroic filters are similar to traditional interference filters but differentiate themselves by reflecting all unwanted wavelengths. Consequently our dichroic range also offers minimal absorbance characteristics. Our dichroic filters are available in longpass, shortpass, bandpass, bandblocking and colour correction types over a range of wavelengths. Dichroic shortpass and longpass filters can also act as hot and cold mirrors respectively.  Dichroic filters can divide natural light from a certain wavelength into two parts, one of which passes through, and the other is reflected or absorbed. Filters that allow longer wavelengths of light to pass through are referred to as long wave pass filters, and filters that allow shorter wavelengths of light to pass through are referred to as short wave pass filters. The desired spectral range can be achieved by using different dichroic filters. Dichroic Longpass Filters Cut-On Wavelength Transmission Wavelength Reflection Wavelength Wavelength Range(nm) Wavefront Tolerance Material Diameter 400 420-1600 350-375 350-1600 1/4λ Fused Silica 12.5 25 450 470-1600 350-430 350-1600 1/4λ Fused Silica 12.5 25 500 520-1600 350-480 350-1600 1/4λ Fused Silica 12.5 25 550 575-1600 415-515 415-1600 1/4λ Fused Silica 12.5 25 600 625-1600 460-570 460-1600 1/4λ Fused Silica 12.5 25 650 675-1600 495-610 495-1600 1/4λ Fused Silica 12.5 25 700 725-1600 535-600 535-1600 1/4λ Fused Silica 12.5 25 750 780-1600 565-715 565-1600 1/4λ Fused Silica 12.5 25 800 830-1600 600-760 600-1600 1/4λ Fused Silica 12.5 25 850 880-1600 635-805 635-1600 1/4λ Fused Silica 12.5 25 900 935-1600 675-855 675-1600 1/4λ Fused Silica 12.5 25 Dichroic Shortpass Filters Dichroic Shortpass Filters Cut-Off Wavelength Transmission Wavelength Reflection Wavelength Wavelength Range(nm) Wavefront Tolerance Material Diameter 400 325-385 420-485 325-485 1/4λ Fused Silica 12.5 25 450 325-430 470-545 325-545 1/4λ Fused Silica 12.5 25 500 325-480 520-610 325-610 1/4λ Fused Silica 12.5 25 550 400-530 575-725 400-725 1/4λ Fused Silica 12.5 25 600 400-580 625-795 400-795 1/4λ Fused Silica 12.5 25 650 400-630 675-850 400-850 1/4λ Fused Silica 12.5 25 700 400-680 725-990 400-990 1/4λ Fused Silica 12.5 25 750 400-725 800-990 400-990 1/4λ Fused Silica 12.5 25 800 400-775 850-1050 400-1050 1/4λ Fused Silica 12.5 25 850 880-1600 635-805 635-1600 1/4λ Fused Silica 12.5 25 900 400-820 910-1110 400-1110 1/4λ Fused Silica 12.5 25

Dichroic Shortpass Filters Cut-Off Wavelength Transmission Wavelength Reflection Wavelength Wavelength Range(nm) Wavefront Tolerance Material Diameter 400 325-385 420-485 325-485 1/4λ Fused Silica 12.5 25 450 325-430 470-545 325-545 1/4λ Fused Silica 12.5 25 500 325-480 520-610 325-610 1/4λ Fused Silica 12.5 25 550 400-530 575-725 400-725 1/4λ Fused Silica 12.5 25 600 400-580 625-795 400-795 1/4λ Fused Silica 12.5 25 650 400-630 675-850 400-850 1/4λ Fused Silica 12.5 25 700 400-680 725-990 400-990 1/4λ Fused Silica 12.5 25 750 400-725 800-990 400-990 1/4λ Fused Silica 12.5 25 800 400-775 850-1050 400-1050 1/4λ Fused Silica 12.5 25 850 880-1600 635-805 635-1600 1/4λ Fused Silica 12.5 25 900 400-820 910-1110 400-1110 1/4λ Fused Silica 12.5 25

Our UV window film controls heat and glare, doubles the life of furnishings, and protects against harmful solar rays, while letting visible light through.

Our dichroic filters are available in longpass, shortpass, bandpass, bandblocking and colour correction types over a range of wavelengths. Dichroic shortpass and longpass filters can also act as hot and cold mirrors respectively.

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.”

Notchfilter

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.

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.

Bandpassfilter

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.

Dielectric mirror

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.

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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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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).

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.

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Hyperion Optics’s complete range of cost effective dichroic filter range offers superior transmission, reflection and absorption characteristics.

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.

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.”

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.

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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.

Opticalfilter

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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.

Low passfilter

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.

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.

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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.

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.

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.)

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.

dichroic中文

Dichroic Longpass Filters Cut-On Wavelength Transmission Wavelength Reflection Wavelength Wavelength Range(nm) Wavefront Tolerance Material Diameter 400 420-1600 350-375 350-1600 1/4λ Fused Silica 12.5 25 450 470-1600 350-430 350-1600 1/4λ Fused Silica 12.5 25 500 520-1600 350-480 350-1600 1/4λ Fused Silica 12.5 25 550 575-1600 415-515 415-1600 1/4λ Fused Silica 12.5 25 600 625-1600 460-570 460-1600 1/4λ Fused Silica 12.5 25 650 675-1600 495-610 495-1600 1/4λ Fused Silica 12.5 25 700 725-1600 535-600 535-1600 1/4λ Fused Silica 12.5 25 750 780-1600 565-715 565-1600 1/4λ Fused Silica 12.5 25 800 830-1600 600-760 600-1600 1/4λ Fused Silica 12.5 25 850 880-1600 635-805 635-1600 1/4λ Fused Silica 12.5 25 900 935-1600 675-855 675-1600 1/4λ Fused Silica 12.5 25

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.

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.”

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

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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.”

dichroicmirror中文

Dichroic optical filters consist of thin film dielectric coatings on glass and exhibit sharp transitions between transmitted and reflected wavelengths. Dichroic filters are similar to traditional interference filters but differentiate themselves by reflecting all unwanted wavelengths. Consequently our dichroic range also offers minimal absorbance characteristics.

Ocular Lens (or eyepiece). Focuses the image from the objective into your eye. · Eyepiece Tube. Connects the eyepiece with the objective lens. · Objective Lenses.

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.

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.

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.

Dichroic filters can divide natural light from a certain wavelength into two parts, one of which passes through, and the other is reflected or absorbed. Filters that allow longer wavelengths of light to pass through are referred to as long wave pass filters, and filters that allow shorter wavelengths of light to pass through are referred to as short wave pass filters.

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.