Contact prescriptions contain additional numbers and abbreviations that don't appear in eyeglass prescriptions, including "BC," for "base curvature." This refers to the way that your cornea curves. It's necessary to include this detail because the shape of your contact lens needs to correspond to the shape of your cornea to ensure a good fit. Contact prescriptions also include the term "DIA," which is short for "diameter," or the distance from one edge of the contact lens to the other. This is measured in millimeters. A contact prescription should name the brand of contact lenses that your eye doctor prescribes, as well as an expiration date for the prescription.

If you have astigmatism — when the cornea, or lens of the eye, has an irregular shape, causing blurry vision — your prescription includes two additional abbreviations. "CYL" is short for "cylindrical power," which determines how strong a cylindrical lens must be to correct your astigmatism. Additionally, the term "Axis" will appear on the prescription, referring to the way that the cylindrical lens needs to be tilted to correct the astigmatism. If you don't need astigmatism correcting lenses, your eye doctor may write "DS," for "diopters sphere," meaning your eyes have a regular, spherical shape.

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Typesof microscope objectives

Meanwhile, an objective lens for which the degree of chromatic aberration correction to the secondary spectrum (g ray) is set to medium between Achromat and Apochromat is known as Semiapochromat (or Flulorite).

Eyeglass prescriptions and contact prescriptions often have the abbreviation "SPH" on them, which stands for "spherical correction." In some cases, they have "PWR" listed instead, which stands for "power." Both terms refer to the strength of the prescription. The number that's listed will be measured in diopters, a term that refers to corrective lens strength. It will be preceded by a plus sign (+) if you're farsighted or a minus sign (-) if you're nearsighted. Sometimes, an eyeglass or contact prescription may include information labeled "ADD," which is short for "additional correction." This is where details about bifocals, multifocal lenses or progressive lenses would appear.

Objective lenses are roughly classified basically according to the intended purpose, microscopy method, magnification, and performance (aberration correction). Classification according to the concept of aberration correction among those items is a characteristic way of classification of microscope objectives.

Stage clipsmicroscope function

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We have locations all across Alabama. No matter where you are in the state, quality eye care and comprehensive eye exams are always close! Reach out now to schedule an appointment at EyeCare Associates so you can start focusing on your eye health.

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Thinking about switching from glasses to contact lenses? Or are you considering alternating between wearing contacts and glasses? You may notice that your contact prescription looks different than your prescriptions for glasses. If you're entirely new to receiving prescriptions and you're planning to correct your vision with contacts, the text on the slip of paper may look like a foreign language.

Function ofstagein microscope

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High power objectivemicroscope function

When you receive a prescription for contacts, your eye doctor should explain why they're prescribing a certain type of contact. For example, you may have an astigmatism that needs to be corrected. Or you may have a more complex prescription because you need contacts to help you see both near and far (multifocal lenses). EyeCare Associates provides several specialty contact lenses to help those with different eye conditions.Additionally, the prescription includes information about the contact lens brand that your eye doctor recommends. They may recommend a certain brand of contacts for many reasons, including the shape and curvature of your cornea, the complexity of your prescription, whether you have dry eyes or other factors. Your doctor should be interested to hear about what you're seeking from contact lenses. Together, based on your prescription and other factors, you should be able to find contacts that are comfortable, fit well and help with vision correction.Find a location and schedule an eye exam at EyeCare Associates to help determine which type of contact lens works best for you.

A variety of microscopy methods have been developed for optical microscopes according to intended purposes. The dedicated objective lenses to each microscopy method have been developed and are classified according to such a method. For example, "reflected darkfield objective (a circular-zone light path is applied to the periphery of an inner lens)", "Differential Interference Contrast (DIC) objective (the combination of optical properties with a DIC( Nomarski）prism is optimized by reducing lens distortions)", "fluorescence objective (the transmittance in the near-ultraviolet region is improved)", "polarization objective (lens distortions are drastically reduced)", and "phase difference objective (a phase plate is built in) are available.

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An objective lens is the most important optical unit that determines the basic performance/function of an optical microscope To provide an optical performance/function optimal for various needs and applications (i.e. the most important performance/function for an optical microscope), a wide variety of objective lenses are available according to the purpose.

diffuse · to spread or cause to spread in all directions · to undergo or cause to undergo diffusion · to scatter or cause to scatter; disseminate; disperse.

Low power objectivemicroscope function

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The purposes of optical microscopes are broadly classified into two; "biological-use" and "industrial-use". Using this classification method, objective lenses are classified into "biological-use" objectives and "industrial-use" objectives. A common specimen in a biological use is fixed in place on the slide glass, sealing it with the cover glass from top. Since a biological-use objective lens is used for observation through this cover glass, optical design is performed in consideration of the cover glass thickness (commonly 0.17mm). Meanwhile, in an industrial use a specimen such as a metallography specimen, semiconductor wafer, and an electronic component is usually observed with nothing covered on it. An industrial-use objective lens is optically designed so as to be optimal for observation without any cover glass between the lens end and a specimen.

If you wear eyeglasses, you may recognize some abbreviations or text from your eyeglass prescription as you review your new contact prescription. Whether you're wearing glasses or contacts, this information helps identify the type of lenses and the power of the lens you need. Some of the abbreviations that appear in prescriptions are the same, including "OD" for "oculus dexter" and "OS" for "oculus sinister." "OD" is the Latin term for the right eye and "OS" is the term for the left eye.

Photography or image pickup with a video camera has been common in microscopy and thus a clear, sharp image over the entire field of view is increasingly required. Consequently, Plan objective lenses corrected satisfactorily for field curvature aberration are being used as the mainstream. To correct for field curvature aberration, optical design is performed so that Petzval sum becomes 0. However, this aberration correction is more difficult especially for higher-magnification objectives. (This correction is difficult to be compatible with other aberration corrections) An objective lens in which such correction is made features in general powerful concave optical components in the front-end lens group and powerful concave ones in the back-end group.

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Function ofcondenserin microscope

In the optical design of microscope objectives, commonly the larger is an N.A. and the higher is a magnification, the more difficult to correct the axial chromatic aberration of a secondary spectrum. In addition to axis chromatic aberration, various aberrations and sine condition must be sufficiently corrected and therefore the correction of the secondary spectrum is far more difficult to be implemented. As the result, a higher-magnification apochromatic objective requires more pieces of lenses for aberration correction. Some objectives consist of more than 15 pieces of lenses. To correct the secondary spectrum satisfactorily, it is effective to use "anomalous dispersion glass" with less chromatic dispersion up to the secondary spectrum for the powerful convex lens among constituting lenses. The typical material of this anomalous dispersion glass is fluorite (CaF2) and has been adopted for apochromatic objectives since a long time ago, irrespective of imperfection in workability. Recently, optical glass with a property very close to the anomalous dispersion of fluorite has been developed and is being used as the mainstream in place of fluorite.

Depending on your individual needs, your Alabama eye doctor can help you decide which type of contact lens works best for you. If you are interested in finding out if RGP contact lenses are right for you, or want to understand your contact lenses prescription, make an appointment with us for more information. Find a location near you to begin scheduling your appointment.

Axial chromatic aberration correction is divided into three levels of achromat, semiapochromat (fluorite), and apochromat according to the degree of correction. The objective lineup is divided into the popular class to high class with a gradual difference in price. An objective lens for which axial chromatic aberration correction for two colors of C ray (red: 656,3nm) and F ray (blue: 486.1nm) has been made is known as Achromat or achromatic objective. In the case of Achromat, a ray except for the above two colors (generally violet g-ray: 435.8nm) comes into focus on a plane away from the focal plane. This g ray is called a secondary spectrum. An objective lens for which chromatic aberration up to this secondary spectrum has satisfactorily been corrected is known as Apochromat or apochromatic objective. In other words, Apochromat is an objective for which the axial chromatic aberration of three colors (C, F, and g rays) has been corrected. The following figure shows the difference in chromatic aberration correction between Achromat and Apochromat by using the wavefront aberration. This figure proves that Apochromat is corrected for chromatic aberration in wider wavelength range than Achromat is.

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Understanding the abbreviations and numbers may seem complex, but once you know how to read a prescription, you should be able to decipher any contacts prescription that comes your way.

Objective lensfunction

What isobjective lensin microscope

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An optical microscope is used with multiple objectives attached to a part called revolving nosepiece. Commonly, multiple combined objectives with a different magnification are attached to this revolving nosepiece so as to smoothly change magnification from low to high only by revolving the nosepiece. Consequently, a common combination lineup is comprised from among objectives of low magnification (5x, 10x), intermediate magnification (20x, 50x), and high magnification (100x). To obtain a high resolving power particularly at high magnification among these objectives, an immersion objective for observation with a dedicated liquid with a high refractive index such as immersion oil or water charged between the lens end and a specimen is available. Ultra low magnification (1.25x, 2.5x) and ultra high magnification (150x) objectives are also available for the special use.

If your eye doctor gives you both prescriptions, you may notice some of the numbers listed alongside the corresponding abbreviations are different. This isn't a mistake; the prescriptions are different because people wear eyeglasses and contacts differently. Contacts sit on the surface of your eye, while eyeglasses sit a short distance away from your eye. Because you'll be looking through each lens from a slightly different distance, it's necessary to adjust the prescription accordingly. This ensures each type of corrective lens does its job from the appropriate distance.

Not only can you get sunglasses from EyeCare Associates, but you can also invest in prescription sunglasses from us. With prescription sunglass lenses, you can improve your vision, protect your eyes, and make a fashion statement simultaneously.