Objective lensmagnification

Do you need an individual objective for your application? Then contact our Leica OEM Optic Center so that we can offer you a customized solution.

Varifocal progressive lenses use a simplistic design since they're single-vision lenses. They work by providing gentle, gradual changes of visual distance in different parts of the lens material: Distance vision at the top, intermediate vision in the center, and near vision at the bottom of the lens. You can see at varying distances depending on where you look in the lens. The seamless transition between vision distances makes for a higher-quality vision correction experience. This design, however, has some drawbacks, as it can take time for your brain to adapt. Because no visual lines in the lenses help guide your eyes to the magnification you need, you must train yourself to know where to look. For instance, you'll need to look down at the right spot for reading, straight ahead for distance, and between those two areas for intermediate distance or computer work. During this eye- and brain-training process, you may experience symptoms including eye strain, headaches, dizziness, and nausea.

In contrast to varifocals, which have magnification changes gradually throughout the lenses, bifocals and trifocals have two and three visual magnification areas respectively. These magnification areas are divided by strict "transition lines." These changes can cause something called an "image jump," where what you're looking at can quickly alter in clarity and apparent position as you look across the prescription lines in the lenses. Bifocals correct for both close-up and far vision, with one line (which is sometimes visible, sometimes not) dividing the lens. To see close up, you look into the bottom of the lens. To see into the distance, you look out the top area of the lens. Trifocals have three visual magnification areas: close-up, mid-range, and far vision. You look into the bottom, middle and top parts of the lenses, respectively, for those different visual areas.

Leica microscope objective lenses are designed and made by our optics specialists to have the highest performance with a minimum of aberrations. The objectives help to deliver superior microscope image quality for many applications, such as life science and materials research, industrial quality control and failure analysis, and medical and surgical imaging.

Objective lens microscopefunction

The objective lens of a microscope forms a magnified, real, intermediate image of the sample or specimen which is then magnified further by the eyepieces or oculars and observed by the user as a virtual image. When a camera is used to observe the sample, then a phototube lens is installed after the objective in addition to, or even in place of, the eyepieces. The phototube lens forms a real image of the sample onto the camera sensor. The objective’s numerical aperture (NA), its ability to gather light, largely determines the microscope’s resolution or resolving power to distinguish fine details of the sample. Also, the working distance, the distance between the sample and objective, and the depth of field, the depth of the space in the field of view within which the sample can be moved without noticeable loss of image sharpness, both greatly depend on the properties of the objective lens. For more information, refer to: Collecting Light: The Importance of Numerical Aperture in Microscopy, How Sharp Images Are Formed, & Optical Microscopes – Some Basics & Labeling of Objectives

Objective lens on a microscope definitionand function

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Whether you need help buying varifocals or just need your annual eye exam, the experienced eye doctors at eyecarecenter are here to help. We can help you explore different types of lenses offering various vision correction solutions to find the perfect treatment for your eyes.

Microscopeparts

Objective lens on a microscope definitionwikipedia

Getting used to varifocal glasses can take some time. To help you get situated, your neighborhood eye doctors at eyecarecenter have some advice. First, don't move your eyes to see at all distances. Instead, rely on your head movements and point your nose where you need to look. Second, don’t be discouraged. Give yourself time to adapt. It might take days or even a few weeks for you to get used to the varifocal lens change. Lastly, don't give up — keep wearing them (though you can take them off briefly to give yourself a break). If you're struggling contact your eyecarecenter eye doctor for further advice.

Stage clipsmicroscopefunction

The optics of the most basic microscope includes an objective lens and ocular or eyepiece. The objective lens is closest to the sample, specimen, or object being observed with the microscope (see the schematic diagram below). For more information, refer to the article: Optical Microscopes – Some Basics Show schematic diagram

Leica apochromats are objectives for applications with highest specifications in the visual range and beyond, offering field flatness up to 25 mm. The absolute values of the focus differences for the red wavelength and the blue wavelength to green wavelength (3 colors) are ≤ 1.0 x depth of field of the objective.

Leica achromats are powerful objectives for standard applications in the visual spectral range, offering field flatness (OFN) up to 25 mm. The absolute value of the focus differences between red wavelength and blue wavelength (2 colors) is ≤ 2x depth of field of the objective.

Another difference between the lens types is cost: Varifocal lenses are usually more expensive than bifocal and trifocal lenses due to their unique single-lens design. Depending on your individual needs, your eye doctor can help you decide which type of lens works best for you. With the many advantages that varifocals offer, they might be the right option.

Types ofobjectivelenses

Varifocal lenses (also called progressive or multifocal lenses) are a specialty lens that corrects both near and distance vision. This means that if you have presbyopia and another refractive error like nearsightedness (also known as myopia), farsightedness (hyperopia), or astigmatism, these lenses can help you see at different distances for tasks like driving and reading. They can also help you reduce your number of vision correction products by eliminating your need for reading glasses or other pairs of glasses. Instead, all you need to do is wear a single pair of varifocals.

Stagemicroscopefunction

All Leica objectives are marked with codes and labels. These identify the objective, its most important optical performance properties, and the main applications it can be used for. For more information, refer to: Labeling of Objectives

Is it getting tougher to see up close? Are you over the age of 40? You could have presbyopia, the natural aging process that makes seeing up close a challenge for everyone starting in their 40s. If you also need glasses or contact lenses to correct certain refractive errors, then varifocal lenses might be a great option for you.

Schedule an appointment at your nearest North Carolina eyecarecenter to find out whether varifocal lenses are right for you.

To make it easier for you to find which Leica objectives work best for your microscope and application, you can take advantage of the Objective Finder

Other types of multifocal lenses that correct for presbyopia include bifocals and trifocals. There are some differences between varifocal glasses, contact lenses, bifocals, and trifocals. The expert North Carolina eye doctors of eyecarecenter are here to help you figure out which pair of lenses works best for you!

For standard applications, Leica Microsystems offers an extensive range of top-class microscope objectives. There are also Leica objectives which have been optimized for special applications. The highest-performance Leica objectives feature maximum correction and optical efficiency and have won several awards. All over the world, scientists are relying on Leica microscope objectives to gain insights into their area of research.

Leica semi-apochromats are objectives for applications in the visual spectral range with higher specifications, offering field flatness up to 25 mm. The absolute values of the focus differences for the red wavelength and the blue wavelength to green wavelength (3 colors) are ≤ 2.5x depth of field of the objective.

Trying to decide if varifocal lenses are the right choice for you? Schedule an appointment at any of our eye care locations across the state of North Carolina. Together we can assess your eyes and come up with a solution that’s right for you. Clearer vision is just a call or click away!