The transmittance of the material is important to be the influence of the lens, so the high transmittance material Fresnel Factory using is Poly visible (UV CUT).

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.

Concentration rate is ratio between area of solar cell and area of Fresnel lens. Ex) Fresnel lens size 120*120mm → area of lens is 14400mm2 Solar cell size 5*5mm → area of solar cell is 25mm2 Concentration rate is 14400/25 = 576 times

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.

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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.

From F1.2, the efficency is dramatically droped. It shows there is a certain ratio between focal length of fresnel and diameter of lens.

According to our customer’s needs, we recommend ideal solution from our 106 existing products, which are increasing in diversity. We are prepared to take from design to prototype to volume production.

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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.

Also we design to use more 3mm Optical PMMA for loner life time and to have 0.5 ~ 1.0mm groove pitch for higher solar concentration.

Fresnel lens,also known as threaded lens, is a sheet made of PMMA material,which is also made of glass.the surface of the lens is smooth on one side and the concentric circles on the other side are small to large.its texture is designed according to the dryness of the light involved in the disturbance and the relative sensitivity and acceptance angle requirements.The light enters from one side passes through the Fresnel lens on one side and focuses out to a point or in parallel light.Such lenses are usually designed as collimating mirrors(such as Fresnel lenses for projection,magnifying)and concentrating mirrors(such as Fresenl lenses for collecting heat for solar energy)

(If groove pitch is density, then quality of image that is maginifed is clearer.If groove pitch is width, then efficince of concentration of light is higher.)

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.

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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.

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.

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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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.

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.

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.

However because of transmittance rate and other obstructs, multiple 80% is reasonable. Adjusted concentration rate is (14400*0.8)/25 = 460 times