On the rotating nosepiece are many objective lenses with varying magnification and numerical aperture. For the objective lens to be properly aligned, the nosepiece must click into position.

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It is a type of intraocular lens. Both near and far objects can be in focus simultaneously with this intraocular lens design, which corrects for both near and distant vision.

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Light is projected through an opening in the level, hitting the object and then entering the objective to magnify it. An image is produced, and this image serves as an object for the ocular lens to magnify. The magnification obtained by the target compounded by the magnification achieved by the ocular lens equals the total magnification achievable with the microscope.

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A condenser is an apparatus at the base of most microscopes that condenses light rays through a solid beam. The amount of light that passes through the condenser is regulated by a diaphragm. The light microscope has both coarse and fine adjustments.

Ophthalmology is a medical and surgical specialty that focuses on the diagnosis and treatment of eye diseases. Ophthalmologists can treat eye diseases such as cataracts, proptosis, glaucoma, etc.

Certain classes of optical objects, most lenses, are used in some optical instruments such as telescopes, infrared viewers, and microscopes and are referred to as objectives and ocular lenses. Eyepieces pair up with microscope objectives to magnify the intermediate image even further, allowing specimen information to be seen. The ocular lens is on the side of the observing eye, while the objective is on the side of the observed object. Professional optical instruments usually allow for the simple ocular exchange and the use of oculars with various parameters. It is typically housed in a cylindrical housing and contains a single optical lens or a combination of lenses (barrel).

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The Huygenianeyepiece is the most basic negative eyepiece configuration used on most teaching and laboratory microscopes with achromatic objectives. Negative eyepieces have two lenses  The eye-lens, which are nearest to the observer's eye, are called the eye-lens, and the field lens, which is behind the diaphragm, is also called the field lens.

The image is magnified by the ocular lens, also known as an eyepiece. It has an ocular micrometer, which is a measuring scale. There are no units on the ocular micrometer.

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A barlow lens is a separate lens placed in the telescope focuser before the eyepiece to expand the effective focal length, often by 2x, 3x, ...

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The majority of microscopes have a parfocal lens. By switching from one objective to the next, this term refers to the microscope remaining in focus.

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The objective lens collects light from the sample, magnifies the image, and projects the enlarged image into the body tunnel. Since no single objective lens may meet all of a user's needs, the rotating nosepiece is equipped with multiple objective lenses of varying magnification and numerical aperture.

Toric IOLs: This is a monofocal IOL that aids in the correction of astigmatism. Astigmatism is a defect in refraction in which light is not focused uniformly on the retina. At any distance, this causes blurry or blurred vision. Astigmatism may be corrected with glasses, contact lenses, or laser eye surgery. It may be more expensive than a monofocal IOL because it's a luxury lens.

Negative eyepieces with an internal diaphragm and positive eyepieces with a diaphragm below the lenses are the two main types of eyepieces classified according to lens and diaphragm arrangement.

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The stage refers to the horizontal surface on which the slide is mounted. Spring-loaded clips hold the slide in place, and gear knobs on the stage allow it to travel around the stage. Two perpendicular scales are available on the stage for recording the location of an object on a slide.

A monofocal intraocular lens (IOL) is a single-focus intraocular lens. Monofocal IOLs may be chosen for close focus, mid-distance focus, or distant focus by a cataract surgeon. Only one of these three options is available, and the priority will remain the same following surgery.

The word ‘ocular’ means connected to the eye. An eyepiece, also known as an ocular lens, is a lens used in optical devices. It is called so because someone looks through the device; it is normally the lens that is nearest to the eye.

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A compound light microscope usually has four objective lenses: a scanning lens (4X), a low-power lens (10X), a high-power lens (40 X), and an oil immersion lens (40 X) (100 X). The total magnifications possible with a 10x ocular lens are 40 X with the scanning lens, 100 X with the low power lens, 400 X with the high power lens, and 1000 X with the oil immersion lens.