Almost 80 percent of the population in the world has seen problems. So you can say eyeglasses are an inseparable part of people’s life. Those with eye problems can not think of a day without their eyeglasses. But when the first eyeglass was invented is not clear. It is believed that in the 13th century, the Venetian glass blowers used reading stones that were made from solid glass and were placed in a single handheld frame made from wood or bone. These were like magnifying glasses.
The actual eyeglass concept was most probably introduced in the 12th century in Pisa, Italy, by Salvino D’Armate. He used two small glasses in one frame, which worked like magnifying glasses, and used them to read. These could be mounted on the bridge of the nose. All these glasses helped read or look at close objects. In early 1400, glasses for looking far were introduced. In the 16th century, the first eyeglass frame, like the modern one, was invented by Spanish craftsmen. In the 17th century, people properly understood the concept of nearsightedness and farsightedness. And they also got a clear idea of how concave and convex lenses work.
There are mainly two problems in seeing that may happen to your eyes. One is that you can not see things the far, and the other has problems seeing things closer to you. The first one is called myopia, and the latter is called hypermetropia or presbyopia. In myopia, the image you want to see is projected in front of your retina, and the reason behind it is that the focal length of your eye lens has decreased.
In hypermetropia or presbyopia, the image of the object is projected behind your retina. This happens as the focal length of your eye lens increases for hypermetropia, and for presbyopia, your eyeball gets hard and loses its ability to focus properly. Myopia is treated using a progressive concave lens, and hypermetropia, or presbyopia, is treated using a convex lens. For people above 40, both problems can occur.
In that case, a contact lens that helps look far and near is called a bifocal lens. Our focus in this article will be convex lenses or reading glasses. This article will be helpful for you to know how to choose reading glasses.
Types of Lenses:
- Concave: This type of lens is preferable for people who can not see the far as the image of the object is projected in front of the retina due to a decrease in focal length of the eye lens. The concave lens helps project the image on the retina, thus solving the myopia problem.
- Convex: These lenses are best for people who can not see objects near them or can not read properly as the image of the thing they are trying to look at is projected behind the retina. This happens when the focal length of the eye increases. The convex lens projects the image on the retina, thus solving the problem.
- Bifocal: These types of lenses have two parts. The upper part works as a concave lens, and the lower part works as a convex lens.
- Trifocal: These types of lenses have three parts. Two parts are for seeing far away and reading or looking at very close range. The third or upper part helps you see things at an intermediate distance or within your arms reach.
- Anti-reflective: This coating helps your eyes to avoid glares and reflections.
- UV protective: This coating is specially designed to save your eyes from eye strain because of ultraviolet rays from the sunlight.
- Scratch-resistant: This type of coating helps prevent your lenses from getting scratched easily.
- Blue light coating: Due to mobile devices and computers, our eyes may feel hurt or fatigued. This happens due to harmful blue lights from these devices. These blue lights directly pass through the retina by harming it. The blue light coating helps block this harmful light from harming your eyes.
- Photochrome: Some people may find it difficult to work in direct sunlight. Photochromic coating or photochromic lenses are helpful for them. This coating changes the color of the glass to too dark to avoid direct sunlight.
- Tinted coating: Tint can help to see better. Yellow-type tint increases contrast, gray does not change the color of objects, and light tint may be helpful to hide the wrinkles around your eyes.
- Mirror coating: Mirror coating is for fashion only. This coating is available in many colors. This coating hides your eyes.
Type of Frames:
- Full rimmed: This frame encloses the lenses and is quite rugged. Full rimmed frames can be found in both plastic and metal.
- Rimless: These frames have only the arms, bridge, and hinges. They are very lightweight.
- Semi-rimless: These frames only cover the upper portion of the lenses. Lightle heavier than rimless glasses.
- Low bridge: These frames are suitable for those with a low nose bridge.
- Wireframes: These lightweight frames are only for circular face shape lenses.
How to Choose the Perfect Reading Glass?
If you are suffering from vision problems, you first have to consult with an eye doctor. Tell him what problem you are facing and how severe it is. He will check your eyes and give you prescription glasses or prescription reading glasses, lenses, or eyeglasses for your eyes. In most cases of presbyopia, doctors prefer reading glasses.
If your eye problem is not severe, you can go for over-the-counter glasses. First, you should take a diopter strength eye exam. A Diopter chart is a chart in which there are rows of words according to the power of the eyes. You can decide the lens power by understanding which row you can see clearly. After getting the power from the test, you can decide what type of lens you want. Plastic lenses are more durable than glass lenses. If you suffer from sunlight, then choose photochromic lenses.
If you frequently work on a laptop or computer and use mobile phones a lot, then obviously you should go for blue light lenses. After choosing the type of glass, you can choose what kind of frame you like or best suits you. If you can not get a diopter test over the counter, reading glasses have magnification marked on them. You can try several, then choose the one through which you can see better.
The eyes are very important parts of your body. Negligence of eye problems can cause permanent damage to your eyes. Whenever you feel uneasy or have trouble with your vision, please consult with a good eye doctor first and follow whatever he prescribes. You should check your eyes with a doctor at least once a year. Hopefully, by going through this article, you will understand how to choose reading glasses.