Your glasses are a big investment in your health and happiness. Caring for them properly can help protect your lenses and frames from sudden, accidental damage as well as long-term wear and tear. With a few smart choices and just a bit of luck, your current pair may give you many years of comfortable, crystal-clear vision.

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Ideally, you would use a Raman instrument with high spectral resolution across the whole Raman range. This gives you better chemical specificity. You can then identify, differentiate and investigate a wider range of materials.

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In contrast, the Raman spectrum of polystyrene is more complex. The molecule is less symmetric and has hydrogen atoms in addition to carbon atoms. There are also different bond types connecting the atoms.

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Wipe with a lint-free microfiber cloth. Cleaning cloths come with almost every pair of glasses, and should be replaced when lost. DO NOT use paper towels, hand towels, your shirt, or other household products to clean your glasses, as they can easily scratch the lenses due to their textured surfaces.

Raman spectra of two polyethylene samples showing differences in intensities and band widths. These spectral differences are due to varying degrees of crystallinity.

Scratch-resistant lens coatings are great, but it would be a huge mistake to rely on them to do 100% of the work. Cleaning your glasses regularly—and properly—will not only keep your vision sharp and clear, but also reduce the risk of distracting and unsightly scratches.

Characteristic vibrational frequencies of chemical bondsThe frequencies of vibration depend on the masses of the atoms involved and the strength of the bonds between them. Heavy atoms and weak bonds have low Raman shifts. Light atoms and strong bonds have high Raman shifts.

You can view the vibrations of a complex molecule as partly consisting of many simple diatomic vibrations. However, you should also consider the vibrations of larger groups of atoms to get a full understanding of the Raman spectrum. For example, the Raman spectrum of polystyrene has a band at 1000 cm-1. This is due to the expanding and contracting ‘breathing mode' of the aromatic carbon ring in polystyrene.

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Continue your exploration of Raman and photoluminescence (PL) spectroscopy. We answer your questions on Raman microscopy, fast Raman imaging, data analysis, fluorescence and complementary analytical techniques.

We graphically display the results of our Raman spectroscopy measurements as Raman spectra. The y-axis represents the intensity of the scattered light, while the x-axis represents the energy (frequency) of light. We are interested in the shift in frequency of the Raman-scattered light, so we plot the x-axis frequencies relative to that of the laser. We label the x-axis as the Raman shift (shown by the units cm-1).

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Don’t push your glasses up at the bridge. This can warp the bridge, especially if you have wire frame glasses. Again, use both hands.

Low-frequency Raman bandsYou can also study molecular vibrational and rotational modes with low-frequency Raman shifts, below 100 cm-1. These originate from very heavy atoms or very large-scale vibrations, such as the whole crystal lattice vibrating. Renishaw's Raman instruments enable you to study these modes. You can explore a wide range of materials and crystals, easily distinguishing between different crystalline forms (polymorphs) and layered structures.

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Store or place the glasses lenses up, with only the temples in direct contact with the table surface of bottom of the case. Again, this helps minimize the risk of scratches or stress on the rims.

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The way you store your glasses when you aren’t wearing them can make a big difference. Improper storage can lead to scratching, bent frames, stressed joints, and more.

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In the polystyrene spectrum, we see the high frequency carbon-hydrogen (C-H) vibrations at about 3000 cm-1. The low frequency carbon-carbon (C-C) vibrations are at around 800 cm-1. The C-H vibrations have a higher frequency than the C-C vibrations because hydrogen is lighter than carbon.

Laser power meters are extensively used in laser-equipped laboratories to measure laser powers and observe the continuous wave (CW laser).

That being said, eyeglasses are far from indestructible or undamageable. And it doesn’t take much to turn a formerly perfect pair into one that’s almost unwearable. A large or inconveniently placed chip or scratch can be extremely frustrating and distracting, while bent frames can make wearing your glasses uncomfortable or even distort your vision.

Glasses have come a long way since they were first invented in the 13th century. With modern technology like plastic lenses and scratch-resistant coatings, they’re more durable and easier to care for than ever before.

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The best advice here is to simply store your glasses in a hard case whenever you aren’t wearing them. A hard case not only protects your glasses from getting smushed or bent, but also reduces their exposure to dust and other environmental particles.

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One way of understanding a Raman spectrum is to consider the molecular functional groups as distinct units. This makes it easy to interpret the Raman spectrum of crystals with a regular array of identical atoms, all in the same configuration. For example, diamond contains carbon atoms in a regular tetrahedral network. In these cases, you often see just one dominant Raman band because there is just one molecular environment of the crystal.

Your eyeglasses are designed to be comfortable and help you see the world clearly—without pain, headaches, or distortion. But they’re also precision instruments, and even mild wear or misalignments can have a noticeable, negative impact on their performance.

Similarly, we see the vibrations of two carbon atoms linked by strong double bonds (C=C) at around 1600 cm-1. This is at a higher frequency than two carbon atoms linked by a weaker single bond (C-C, 800 cm-1).

Raman spectra of diamond and polystyrene. The Raman spectrum of polystrene is more complex than that of diamond due to differing bond types.

You can interpret Raman spectra to identify chemicals and get structural information. Raman scattering results from the interaction of light with molecular vibrations. These vibrations are very sensitive to changes in chemistry and structure, so you can spot subtle differences in molecular environment. Generally, all materials produce Raman spectra, except for pure metals.

If you’re having any problems with your current pair, let us know! If you need a new prescription, a comprehensive eye exam with one of our ophthalmologists will help you sort it out. And if you just need a new set of frames, or need your current frames adjusted or repaired, our optical department has you covered.

We can identify unknown materials from their unique Raman spectral fingerprints, typically using software searches of spectral libraries. We use the Raman bands in the fingerprint region (from 300 cm-1 to 1900 cm-1) to identify molecules.

It’s not just what you do to your glasses when you’re not wearing them that matters. The way that you wear them, put them on, and take them off can help you maximize the lifespan of your frames, too.

Raman shifts are sensitive to neighbouring bondsYou can see more subtle effects if you inspect Raman spectra closely. For example, the C-H vibrations of polystyrene appear in two bands, at approximately 2900 cm-1 and 3050 cm-1. The carbons in the former band are part of aliphatic carbon chains, whereas the carbons in the latter band form part of aromatic carbon rings.

A Raman spectrum therefore consists of a number of bands, each associated with a vibrational mode. The spectrum is unique to the material and enables you to identify it. Some researchers aim to fully understand each Raman band and how it relates to vibrational modes. However, most analysts simply identify samples using a spectral library.

You can study differences in material structure by comparing their Raman spectra. You could quantify the degree of crystallinity and distinguish similar crystal forms (polymorphism) of the same chemical. To do this, you would need a Raman spectrometer with high spectral resolution, such as an inVia™ confocal Raman microscope.