Zoom lenses in cameras work in a similar way, with multiple lenses that can be moved together or apart by turning them with your fingers or, on automatic cameras, by pressing a motorized control that does the same thing. Zoom lenses that work this way are known as optical zooms. Digital ...
But the technique is currently about as likely to damage your eyes as wearing daily disposable contact lenses for one year. 因为激光手术是在眼球上进行, 这在手术中被称为“原位”的, 全称为“准分子激光原位角膜磨镶术”, 但大...
Read on for a quick rundown on the history of contacts. We’ll also discuss how contact lenses work. In addition, you’ll learn the best practices for the care and use of your lenses. Above all, you’ll see why you should consider using these convenient vision correction aids! The Hist...
How Sunglasses Work How LASIK Works Does reading in low light hurt your eyes? At night, why does it take my eyes several minutes to get used to darkness? Why do people have red eyes in flash photographs? More Great Links Corrective Lenses - illustrated tutorials Gerber Coburn Optical - equi...
How Does a Fresnel Lens Work? The Magic Behind the Glass The Fresnel lens is a composite compact lens which was developed by a French physicist Augustin-Jean Fresnel for use as lighthouse lenses.Terry W. Eggers / Getty Images Ever gazed at a lighthouse beam and wondered how it shines so...
The lenses improve color contrast by working anotch filter, which allows only certain wavelengths of light to pass through. By removing a narrow band of the spectrum between red and green, the lenses can help a person with trichromatic colorblindness better discriminate between contrasting shades th...
Most lenses have a filter thread in the front where you can screw on camera lens filters. These filters cover a range of options, including adding tints or darkening a scene.
The LensesThe lenses are the essence of the microscope and are at the heart of the question - how does a microscope work? A compound microscope has two or more lenses. The eyepiece or ocular lens sits atop the body tube. Many microscopes are binocular and have two ocular lenses....
How Transitions lenses work Transitions infuses their lenses with trillions of photochromic molecules that change structure when exposed to UV rays. The molecules’ reaction to UV exposure causes the lenses to darken. Using an exclusive, patented formula, the molecules can sense the level of UV exp...
How does a Barlow lens work? Simply put, a Barlow lens increases the effective focal length of the telescope. It does this by diverging light before it enters the eyepiece, which increases the magnification of the image. A Barlow Lens can double the magnification of your view. However, the...