Eyeglasses FAQ

Wearing the wrong prescription eyeglasses will not damage your eyes. While it may be uncomfortable for the time that you spend wearing these wrong prescription eyeglasses, you are not going to damage your eyes or go blind.

One of the best ways you can tell whether your eyeglass prescription is too strong is to undergo a “one eye test.” It’s really simple and you can do this wherever you’d like. All you need to do is put on your glasses and cover one of your eyes (the precise eye does not matter). With your unobstructed eye, stare straight ahead. When doing this, take note of your vision. Does it appear clear? Or is it blurred or hazy? From there, do this same exercise with your other eye. If one or both of your eyes are blurry or hazy, you may have a strong argument that your eyeglass prescription is too strong.

Yes, you will likely need to check-in with your optometrist or ophthalmologist to be 100 percent sure. This article in no way is providing any medical advice. Read this article for more ways.

While you should certainly get the correct prescription, you should not feel any anxiety or fear about the wrong prescription causing any short or long-term damage to your eyes.
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The short answer to this question is yes, absolutely, you can buy glasses online at RX Safety! Our website is a great place to purchase any type of prescription glasses you need depending on your eyesight and style. There are plenty of great options you can find online for whatever type of glasses meet your needs, and the best part is, you never have to leave your couch.

The answer is somewhat complicated. In most cases, it is simply easier to visit your optician or optometrist, undergo an eye exam, and obtain a prescription. But what if you don’t have time to do that? Moreover, what if you don’t have health insurance or have a plan that covers eye care?

The bottom line? You may not necessarily have to obtain a prescription from an eye doctor in order to purchase glasses. To purchase prescription glasses online, you would need to diagnose yourself (which technically wouldn’t be a prescription). However, with that information in hand, you can work with certain online retailers, like Rx-Safety, and purchase your new pair of glasses.

If your prescription is -2.5 or lower, this means that you are legally blind. Visual acuity of -2.5 is equivalent to 20/200 vision. Visual acuity of -3.0, for instance, means that you have 20/250 or 20/300 vision. From there, visual acuity of -4.0 means that you have 20/400 vision. As we discussed here, having this sort of vision means that to see clearly, you need to be much closer to that certain object or person compared to the normal person in the population.

Upon reading your eyeglass prescription, you will immediately notice that there are groups of characters arranged in a two-row table. We are going to go over all of these rows and letters, but to start, it is helpful to focus on the terms “OD” and “OS.” These two terms are easy to understand. OD stands for “oculus dexter,” which is a Latin term for the right eye. OS stands for “oculus sinister,” and as you can guess, that stands for the left eye.

Learn more about how to read your prescription here

For the purposes of this discussion, we are going to direct you to a column that is labeled “add.” Add stands for addition. The basic idea is that this is the power that needs to be added in your prescription in order to give you a clear vision for certain activities.

Ultimately, a 1.75 add can be negative or positive. Let’s start with -1.75. A -1.75 eyewear prescription essentially signifies that you need some additional power to see some objects that are further away. Specifically, we are talking about things like watching television or objects or people at a distance when you are driving. Compared to a -1.25 eyewear prescription, for instance, a -1.75 eyewear prescription is going to be more powerful.

Discover more about 1.75 here. If you are looking for an online retailer to fill your -1.75 or 1.75 prescription, we encourage you to check out our store. At Rx-Safety, we are proud to sell high-quality eyeglasses for any type of prescription. Click here to view our collection or to reach out with any inquiries.

Sphere – Written as SPH often, this is the lens power required and prescribed to correct either long-sightedness or nearsightedness. It is measured in the unit known as diopters (D). You know you are nearsighted if the number that is listed for the Sphere heading in the prescription has a (-) minus sign next to it. Whereas, you are farsighted if there is a (+) plus sign next to it.

Cylinder – Cylinder or CYL is used to identify how much lens power in your prescription is for astigmatism if you suffer from it. It may be that nothing is filled in for that part of the prescription at all. That basically means you either have no or very minor astigmatism that needs to be corrected.

Axis – Now, the axis identifies the lens meridian that has no cylinder power for correcting astigmatism. The axis in your prescription will be measured in numerical form from 1 to 180. Where 180 is your eye’s horizontal meridian, 90 is the vertical meridian.

Discover more about Sphere, Cylinder, and Axis here.