SPH, or sphere, is the amount of lens power needed to correct nearsightedness or farsightedness, whereas CYL, or cylinder, is the amount of lens power needed to correct astigmatism.

No, you cannot use your eyeglass prescription to buy contact lenses or vice versa because eyeglass lenses sit about 12 to 15 mm away from your eyes, whereas contact lenses are directly on your eyes.

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Sphere, also known as degree or power, is the amount of single vision correction you need. CYL is the amount of astigmatism correction you need, and Axis determines the lens angle required to correct your astigmatism.

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Our team is dedicated to providing stress-free home exterior services on time and on budget. As a Georgia-based company, we have worked for years throughout these cities and their surrounding areas, building a reputation as a trustworthy remodeling company that customers can rely on. Our friendly staff is here to provide suggestions and resources to ensure the job gets done in the most efficient manner, so you can save time and energy when tackling your next project.

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If going for energy efficiency, cellular PVC is one of the best choices available. U Value measures how well the window insulates and cellular PVC scores extremely well with a U Value of .48. This is established by the National Fenestration Rating Council which helps consumers compare the performance of windows, doors and skylights.

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Like SPH and CYL, optometrists measure ADD in increments of 0.25 diopters. ADD is always a positive number and ranges from +0.75 to +3.00 for most people.

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EXOVATIONS is here to help you decide which replacement windows will work best for your home. We are able to answer any questions you may have and provide you with at-home consultation. Contact EXOVATIONS to schedule a free quote today!

In other words, because eyeglasses and contact lenses have different distances from your eyes, the amount of correction needed is also different.

The plus (+) or minus (-) sign before SPH indicates whether you are nearsighted or farsighted. If your SPH value is -1.00, you are nearsighted. On the other hand, if your SPH value is +1.00, you are farsighted and need correction for seeing closer objects.

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The material is not the only difference to consider when choosing between vinyl and cellular PVC replacement windows. Both have different qualities that are important in your decision making process, but when when contemplating between vinyl and cellular PVC, consider the following factors when making your choice.

EXOVATIONS provides a vinyl window also made from PVC although manufactured through a different process. Unlike the extruded hollow vinyl, the window components for cellular PVC windows are solid. Cellular PVC window components feature a foam or cell-structure inside. One advantage to replacing your windows with cellular PVC is that they can be nailed, sawn and fabricated like wood. These windows look exactly like wood windows and cellular PVC are stronger than extruded vinyl windows which are of the thinner material. Cellular PVC takes vinyl a step further in strength and durability.

Optometrists measure SPH values in increments of 0.25 diopters, and when people talk about their prescription degree, they’re usually talking about their sphere value.

If your prescription indicates a CYL value, you must have a corresponding Axis value. Conversely, if your prescription does not display a CYL value, you do not need an Axis value.

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Astigmatism relates to an issue in the curvature of your cornea that causes blurred distance and near vision, especially at night.

When it comes to design, vinyl replacement windows come in two shades, white and almond or tan. These windows are not manufactured to be painted making vinyl windows a good choice for spaces where color is not a deciding factor. If you are replacing windows and wish to match your home's trim, cellular PVC windows would be the better choice.

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One major variation is the style difference between the two windows. Cellular PVC windows have the same architectural moldings as traditional wood windows and resemble real wood where vinyl replacement windows do not.

You may be familiar with PVC or polyvinyl chloride; commonly used in plumbing or electrical items. PVC is also a leading material for windows. PVC is essentially a combination of different compounds (plasticizers and pigments.) The main difference between PVC windows and vinyl windows is the manufacturing processes used to make the window components. Vinyl replacement windows are very light, simply because the window components are extruded hollow chambers. Vinyl replacement windows are very common and are considered a simple way to replace your old windows.

Most of our prescription orders take about three days to complete. However, for complex prescriptions, such as when your SPH or CYL values fall beyond the average range, prescription orders can take up to 9 days to complete because optical labs will need to make custom-edged lenses for you.

If nothing appears in your CYL column, you do not require astigmatism correction. However, if you have a CYL value, you must have a corresponding Axis value.

One of the advantages of working with EXOVATIONS when improving your home's exterior is the amount of product options we provide our customers. We are able to give our customers several options for window replacement, one being cellular PVC. Let's explore the difference between vinyl windows and cellular PVC; both made from the same material yet a very different finished product.

ADD, or addition, refers to the amount of magnifying power you would need in multifocal lenses to see closer objects, like a book.