By law, decorative contact lenses , whether they correct vision or not, require a prescription and proper fitting from an eye doctor. Any type of contact lens that can be purchased without a prescription is being sold illegally—and can pose … Continue reading →

10 Best Blue Cut Lenses & Blue Light Blocking Glasses 2021 Feiyold Blue Light Blocking Glasses. Anrri Blue Light Blocking Glasses. K Kenzhou Blue Light Blocking Computer Glasses. Aosm Blue Light Blocking Glasses. Lifeart Blue Light Blocking Glasses. Uvex Ultra-Spec … Continue reading →

You will see more of an object on low power. The depth of focus is greatest on the lowest power objective. Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of … Continue reading →

The illumination system of the standard optical microscope is designed to transmit light through a translucent object for viewing. In a modern microscope it consists of a light source, such as an electric lamp or a light-emitting diode, and a … Continue reading →

If your number is between -0.25 and -2.00, you have mild nearsightedness. If your number is between -2.25 and -5.00, you have moderate nearsightedness. If your number is lower than -5.00, you have high nearsightedness. What is 2.00 vision? Typically, … Continue reading →

In short, Plossl eyepieces are generally better than Kellner eyepieces, but they also tend to be more expensive. The one caveat to this is that Plossls, because of their increased complexity, also have a wider spectrum of possible quality. Are … Continue reading →

The adapter connects the camera to the lens the same way it connects with your DSLR camera, while maintaining similar quality and performance. Do I need an adapter for a Canon lens? A lens adapter helps bridge the divide between … Continue reading →

What is the difference between Magnification and Magnifying power?1 Answer. Magnification Magnifying power (ii) Its value increases with the increase in V. (ii) Its value decreases with the increase in V. What is the magnifying power? In microscope: Magnification. The … Continue reading →

When switching to the 100x lens What should you use? When switching to the 100x lens, what should you use? 100x lenses should be used with a few drops of immersion oil to enhance the image. Can you use 100x … Continue reading →

Generally, your eye doctor will use a keratometer to measure the curve of your cornea, which is the front surface of the eyes – where contacts rest. These numbers help to determine the lens diameter and base curve that appear … Continue reading →

There are several types of aberrations and the most typical and important ones are (i) spherical aberration, (ii) chromatic aberration, (iii) diffraction error, and (iv) astigmatism. What are the two types of aberration? Types of Aberration Spherical Aberration. Coma. Astigmatism. … Continue reading →