Have you ever wondered how your prescription glasses work? Most people who need to wear eyeglasses do it to get their vision corrected so they can see clearly. Due to refractive errors of the eye we experience blurry vision.
What is refractive error of the eye
Refractive error occurs when the light entering our eyes does not focus correctly on the retina. This usually happens due to structural defects where the eye is too long or short or when the cornea is not curved correctly. Lenses of prescription glasses are designed to correct these errors by allowing light to focus properly on the retina producing clear vision.
Before we delve into different types of eyeglass lenses, let’s understand the two main types of refractive errors. Depending on where the light ends up focusing, you will either have blurry distance vision or a blurry close vision.
Wondering if you need vision correction. Here are 5 signs that suggest you need eyeglasses.
1. Myopia – nearsightedness:
When the light entering the eye is bent at such an angle that it focuses at a point in front of the retina, the eye is able to clearly see objects that are nearby but unable to see objects that are at a distance.
2. Hyperopia – farsightedness:
When the light entering the eye is bent at such an angle that it focuses at a point beyond the retina, the eye is able to clearly see objects that are at a distance but unable to see objects up close.
Positive numbers on your eye prescription means correction for farsightedness and negative numbers mean they correct nearsightedness. The weaker your eyesight the larger your prescription number, indicating a stronger prescription. However, there are many people who need vision correction for both close and distance viewing.
In Barbados, you can visit your nearest Courts Optical eye care centre for eye check-up and vision screening to get the right prescription for your eyesight.
Let’s see what single, bifocal, and progressive lenses are and how they work for different vision correction requirements.
Single vision lenses
As the name suggests, single-vision lenses have a single power correction, either positive or negative. For example, if you have myopia (nearsightedness), you’ll be prescribed a minus lens based on how high a correction you need. Similarly, for hyperopia (farsightedness), you’ll need a plus lens to help you see nearby objects clearly.
Bifocal lenses
Bifocal lenses have two focal points and correct your vision for two focal distances. The top portion of bifocal eyeglasses usually uses minus lenses to correct distant vision, while the smaller bottom half uses plus lenses to correct near vision.
A person with two prescription powers for near and far vision correction would need bifocals so they need not carry two separate pairs of eyeglasses. Presbyopia is an example of a sight condition where bifocals might be prescribed by your eye care specialist.
Progressive lenses
Progressive lenses correct vision at all distances: near, middle and far. In bifocal lenses, there is a clear distinction where one type of lens ends and the other starts. So, when changing focus from a far object to a near one, people often experience a “jump” as the focus shifts.
But progressive lenses are made from a more advanced technology where the correction required seamlessly changes from the top of the lenses to the bottom. So, some might prefer these to bifocals and trifocals.
Visit your nearest Courts Optical eyewear store in Barbados for prescription glasses, contact lenses and UV protection sunglasses.
If you have a single prescription then your vision correction needs can be easily met with single vision lenses. But if you have multiple prescriptions for vision correction, discuss your options with your eye care professional. They will analyze your vision requirements and prescribe the kind of lenses that work best for your eye condition.
There are additional factors to consider as well. Progressive lenses, for example, take time to get used to and can be more expensive than bifocals. But once your eyes adjust to them, the convenience they will offer will be worth the investment.
Here is a guide to buying your first pair of eyeglasses.
Hope you enjoyed the post!
Courts Optical Eyewear Stores in Barbados