What makes a 'Progressive' Lens Progressive?

A quick explanation and background of a progressive addition lens (or PAL) is necessary in order to understand the importance of choosing the proper lens for your needs.

A progressive lens gives people an array of prescriptions - placed in the proper positions throughout the lens - to best imitate normal vision. Imagine having the precise correction needed to see a television screen more than 15 feet from you, while reading this article on your desktop computer, and then looking down at your keyboard in order to start entering the address to your favorite website. This, in a nutshell, is exactly what the progressive lens is ideally capable of accomplishing with one pair of glasses.

Having the least amount of peripheral distortion, and one of the wider ranges in both distance power, astigmatism, prism, and add power availability, we find this lens to be very versatile. The most important thing to you is that this product feels very natural in front of your eye. For first-time progressive lens wearers, there is a stigma that it takes a bit of time to adjust to a lens that holds multiple prescriptions. This is often still an issue if places use old technology lenses or don’t take careful measurements to assure the proper placement on the lens in the frame. However, with modern technology, the use of computers to fine tune this amazing product, and careful measurements and lens positioning by your optician, this lens does the best job we have seen in mimicking perfect 20/20 vision at all focal lengths.

Along with the progressive lens itself, there are other additional treatments, or “add-ons” that can immensely improve one’s experience with their glasses. These options include photochromic lenses, anti-reflective coatings, and polycarbonate scratch-resistant lenses.  Talk with your eyecare team about what options might work best for you!

Why Having Astigmatism Isn't Usually That Big a Deal

The word “astigmatism” is used so much in the optometric world that most people have talked about it when discussing their eye health with their doctor.

“Astigmatism” comes from the Greek “a” - meaning “without” - and “stigma” - meaning “a point.” In technical ocular terms, astigmatism means that instead of there being one point of focus in the eye, there are two. In other words, light merges not on to a singular point, but on two different points.

This is experienced in the real world by blurred, hazy vision, and can sometimes lead to eye strain or headaches if not corrected with either glasses or contact lenses.

Astigmatism is not a disease. In fact, more than 90% of people have some degree of astigmatism.

Astigmatism occurs when the cornea, the clear front surface of the eye like a watch crystal, is not perfectly round. The real-world example we often use to explain astigmatism is the difference between a basketball and a football.

If you cut a basketball in half you get a nice round half of a sphere. That is the shape of a cornea without astigmatism.

If you cut a football in half lengthwise you are left with a curved surface that is not perfectly round. It has a steeper curvature on one side and a flatter curve on the other side. This is an exaggerated example of what a cornea with astigmatism looks like.

The degree of astigmatism and the angle at which it occurs is very different from one person to the next. Therefore, two eyeglass prescriptions are rarely the same because there are an infinite number of shapes the eye can take.

Most astigmatism is “regular astigmatism,” where the two different curvatures to the eye lie 90 degrees apart from one another. Some eye diseases or surgeries of the eye can induce “irregular astigmatism,” where the curvatures are in several different places on the eye’s surface, and often the curvatures are vastly different, leading to a high amount of astigmatism.

Regular astigmatism is treated with glasses, contact lenses, or refractive surgery (PRK or LASIK). Irregular astigmatism, such as that caused by the eye disease keratoconus, usually cannot be treated with these conventional methods. In these circumstances, special contact lenses are needed to treat the condition.

The next time you hear that either you or a loved one has astigmatism, fear not.

It is easily corrected, and although astigmatism can cause your vision to be blurry, it rarely causes any permanent damage to the health of your eyes.

If you experience blurred vision, headaches, or eye strain, having a complete eye exam may lead to a diagnosis and treatment of this easily-dealt-with condition.

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Our doctors and staff are committed to providing thorough care with personal attention. At Eye Doctors of Madison, you will find the compassionate care of a small-town doctors' office with the knowledge of a big-city institution. It is our mission to not only treat each patient uniquely but also like family.

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