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If an auxiliary lens is inserted between the objective and eyepiece, the magnification factor of this lens should also be employed in the equation by multiplication with the objective magnification (prior to the division operation). Although the field number is usually limited by the magnification and field diaphragm (stop) size of the eyepiece, there is clearly a limit that is also imposed by the design of the objective lens system. In early microscope objectives, the maximum usable field diameter tended to be about 18 millimeters or considerably less, but with modern plan apochromats and other specialized flat-field objectives, the maximum usable field can sometimes exceed 26 millimeters. Correspondingly, the field of view through microscope camera ports has risen in step with larger objective field numbers and larger camera sensors. The Nikon Eclipse Ti2 inverted microscope in particular offers a 25mm field of view through the camera ports.

Nikon offers a range of eyepiece options featuring magnification and field of view combinations tailored towards a variety of applications.

World-class Nikon objectives, including renowned CFI60 infinity optics, deliver brilliant images of breathtaking sharpness and clarity, from ultra-low to the highest magnifications.

The diameter of the view field in an optical microscope is termed the field number and represents the diameter of the field measured in millimeters at the intermediate image plane. This interactive tutorial explores the effect of varying the field of view size on the viewable specimen area.

Always use a microfiber cloth to clean your lenses before attempting to fix scratches. Take care using any of the following methods, and always contact your optometrist if you have questions about caring for your glasses.

John C. Long and Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.

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Apply the baking soda paste to the scratched area. Using a soft cloth or cotton ball, gently rub the paste using consistent, circular motions. Ensure you don’t push down too hard. Rinse with warm water, dry, and repeat if necessary.

Keep in mind, eyeglasses can be delicate, and any repair method risks further damage. Be cautious when attempting any home repair.

Despite what some may think, most corrective lenses these days aren’t made of glass. Instead, manufacturers make them out of a special plastic that’s much lighter—but can also be more prone to scratches.

The tutorial initializes with a randomly selected specimen visible in the virtual microscope viewport and the field number set to a value of 20. Use the Field of View slider to adjust the field size between 10 and 28 millimeters, and note how the viewable specimen area increases or decreases with the field number. After viewing a specimen, use the Choose A Specimen pull-down menu to select another specimen.

Are you one of the millions of people who rely on glasses to see clearly? If so, you already know that taking care of your glasses helps make sure they provide optimal vision. Of course, regular eye exams are a critical part of maintaining healthy eyes, but good vision care doesn’t stop at the office doors.

Still, whatever lenses you choose, a good and clear pair of glasses can make everyday tasks such as reading, driving, and using a computer much easier. Additionally, sunglasses can protect your eyes from harmful UV rays, dust, and other particles that can cause irritation and damage.

Still, some people prefer it as a last resort. If you do choose to use this cream, only apply a small amount of etching cream to the scratched area and let it sit for a few minutes, no more than 5. Then, immediately rinse the glasses with warm water and dry them with a clean cloth, making sure to remove all the cream.

Even with proper care, glasses can still get scratched. Large scratches that can impede your vision should be dealt with immediately and may require you to replace the lenses. Home repairs might fix minor scratches but can also remove any special coatings on your glasses, such as UV or blue light blocking.

In most cases, the eyepiece field diaphragm opening diameter determines the view field size. The field size in the specimen plane is then defined as the field number divided by the magnification of the objective:

Baking soda is a popular household item that you may use to remove minor scratches from glasses. Mix a small amount of baking soda with warm water to create a paste. You don’t need much baking soda. A couple of teaspoons should do.

Properly caring for your glasses may prolong their lifespan and maintain their clarity. Here are some tips to help you care for your glasses:

The Eclipse Ti2 inverted microscope delivers an unparalleled 25mm field of view (FOV) that revolutionizes the way you see.

Don’t just squirt any old toothpaste on your glasses. Instead, use non-abrasive, non-gel toothpaste and apply a small amount to the scratched area. Then, using circular motions, gently rub the toothpaste into the glasses with a soft cloth and rinse it with warm water.

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Scratches on glasses can be frustrating and distracting, but they don’t have to ruin your vision or your day. Small scratches might be able to be repaired, but it’s much better to prevent the damage in the first place. With the proper care and maintenance, your glasses can last you for a long time.If scratches do happen, you may need to simply replace your glasses. Fortunately, Dr. Jennifer L. Shane & Associates has a wide selection of stylish frames and a dedicated team ready to help you find your perfect pair. So instead of squinting through a field of scratches, come into the office and see clearly again.

Toothpaste is another popular method for removing scratches, but it comes with its own warnings. Some kinds of toothpaste are designed to be abrasive to remove plaque from your teeth. This abrasiveness can, therefore, also be effective in damaging your lenses.

Glass etching cream is a more aggressive method for removing scratches from plastic or polycarbonate glasses, so typically, we wouldn’t recommend it as an option. It can completely remove any coating on your glasses and can permanently damage them if you don’t remove the solution promptly. You should absolutely not use it on glass lenses.

Even with proper care, scratches on glasses can happen over time. So, when it’s your favorite pair, you’ll probably start looking for ways to fix them! Methods using toothpaste, baking soda, and glass etching cream are all options for ways to remove minor scratches from glasses at home.