Do not apply optical cleaning solutions directly onto the optical components of a device, since these can enter the machine and cause spots on other lenses or otherwise damage the device. Instead, apply the cleaning solution to the lens paper or swab first.

Do not touch optical surfaces with your bare fingers, since they leave behind grease and moisture marks that are hard to remove. Wear cotton, lint-free gloves if available and hold loose optical components by their edge (Figure 3).

Always handle loose optical components by their edges. Clean round optical surfaces from the centre to the edge in a widening spiral.

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cotton swabs (Figure 2). Use non-sterile, medical-grade cotton swabs, with degreased fibres that will not release lint. If these are not available, fresh cotton swabs can be prepared with wooden sticks and medical-grade cotton.

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Always remove dust first! Dust particles can produce scratches. Never wipe dust off optical surfaces, especially when they are dry. First use a dust blower to remove dust. Use a camel hair brush, sometimes included as part of the blower (Figure 1), to remove any dust that sticks to the surface.

A dust blower can be found at most photography shops. Some blowers, such as the one pictured, have a built-in lens brush.

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By following these suggestions, you will help ensure that all of the optical surfaces in your eye care equipment perform optimally.

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Keep eye care equipment in an environment that is not humid; this will prevent the growth of fungus on optical components (see Issue 73, page 37).

Repeated cleaning will wear out the surface coating described earlier and the property of the surface may change. It is better to protect optical components from dust, stain and fungus.

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Be careful of sharp instruments, including your fingernails, near optical surfaces. Use wooden, bamboo, or plastic implements instead. Always place optical components on a soft surface to avoid scratches.

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The Green Laser Pointer is perfect for stargazers. It emits a thin but distinct green laser beam that appears to stretch all the way to the stars! It works in light-polluted or moonlit skies just as well as crystal-clear skies in remote locations. It’s great for pointing out stars, planets, constellations and more for others to see. The aluminum laser pointer body is 6″ long and features a convenient pocket clip. Two AAA batteries are included.

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CAUTION: Use the Green Laser Pointer responsibly! Never aim it anywhere near people, animals, moving vehicles, aircraft, or windows

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To remove stains, use a lint-free cotton swab or a lens-cleaning tissue dipped in the optical cleaning solution. For round surfaces, move the swab or tissue in a circular path, starting from the centre and going in a widening spiral towards the edge (Figure 3). For rectangular surfaces, use repeated strokes parallel to each other and in the same direction until you have covered the surface. Repeat this step, using a fresh swab every time, until the stain is no longer visible at any angle under a bright light. If cotton lint is left on the component, remove it using the blower or a clean lens brush.

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Many ophthalmic devices have optical components such as windows, lenses, mirrors, filters, and prisms; even very small irregularities (such as scratches) can cause unwanted scattering of light which reduces quality. The surfaces of lenses, prisms, and windows are often coated with an antireflective layer to prevent loss of light due to reflection. Mirrors have a highly reflecting coating to get maximum reflection of light. Filters have coatings to cut out undesired wavelengths. The coatings are very thin and delicate and can be damaged by improper handling and cleaning.

To eliminate virtually all glare on your eyeglass lenses, ask for Neverglare Advantage, an anti-reflective coating for your lenses.

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First consult the manufacturer. If this is not possible, commercial lens-cleaning solutions sold in camera shops can be used for most optical cleaning. Otherwise try the following, going from weakest (1) to strongest (4) until the surface is clean:

To remove stains on plastic components, use optical cleaning solution number 2 (the water-based solution). Do not use other cleaning solutions on plastic, unless indicated by the manufacturer, because they can permanently cloud the surface.

by BF Zhu · 2022 · Cited by 69 — We propose a laser with the opposite behavior: multi-mode lasing occurs at low output powers, but pumping beyond a certain value produces a ...