Last updated: August 18, 2021

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Welcome to Monederosmart! Activities such as reading, watching a movie, being in class or writing a message are indispensable for any person, whether for learning or recreation, these along with many more examples, are some of those that are conditioned when vision begins to atrophy.

It can be annoying that, while enjoying a movie with the family, you can't read the subtitles well and you have to make an extra effort, the same happens when you want to read your favourite book, but don't worry, that's what glasses are for! To relieve you and make your day to day life easier.

It's a bit complex to go to an optician's to choose the right lens, and sometimes it's confusing when, among so many models and types, you don't know which one is the right one. But that's what we're here for, and in this article we'll show you everything you need to know about lenses.


  • Glasses are a corrective tool that helps people with visual impairment, whether it is due to difficulty focusing, or poor distance or near vision. Regardless of the case, glasses are indispensable, and help to make everyday life easier for people with these optical conditions.
  • The two most popular types are corrective lenses and progressive lenses. The former is customised for particular impairments, while the latter is designed for near, far and intermediate vision, alternating magnification with head movement.
  • There are certain factors that will help you define which model is right for you, all depending mainly on your needs. Key points such as the corrections to be made, the resistance, the lens formula or the handling of the lens will make you consider which one is really right for you, based on your diagnosis.

The Best Lenses: Our Picks

The best way to get to know a product is to see it on the market, so before you really understand what eyewear is, you should have an idea of which ones are the most popular with the public, so you can get a basic idea of what to expect in terms of quality, models and price.

Buying Guide: What you need to know about eyewear

After looking at the most popular models, you can get an idea of what you can find when it comes to eyewear, but there are some things to consider before you make your purchase, and you'll learn about them in the following guide, so you can clear up all your doubts before you pay for your glasses.

The right glasses can be the best support while you study or work. They will make your work easier, saving you headaches. (Photo: ACasualPenguin /

What are glasses and what are their advantages?

Glasses are an adjustment tool for your vision, when it starts to deteriorate due to different factors (age, exposure to light, genetics, etc.). They cannot be considered accessories, as they are indispensable for those who need them. They help to cope with the loss of clear vision.

The most important advantage of lenses is the adjustment they make to the eye. As the eye begins to deteriorate, the lenses grow through the glass, so that they adjust so that the eye can see perfectly through them. This way you are not limited in activities you love to do, such as reading.

Every product you find on the market will present a picture of advantages and disadvantages, and this is completely normal. It is preferable to know all the "sides" of a product before you buy it, so that you know what to expect from it. Remember that just because it has disadvantages, does not make it a bad buy.

  • They improve the range of vision
  • They correct eye problems
  • They can be readjusted according to the progressivity of ocular deterioration
  • They can be heavy after a while, depending on the model
  • They are not permanent, so you cannot forget to wear them
  • They generate dependence

Corrective lenses and progressive lenses - what should you pay attention to?

There are two very important models in ophthalmology when it comes to lenses, and it is very important that you know the difference between one and the other, as they are designed for different cases, and you should choose yours according to your personal needs.

Lenses have been evolving, seeking to improve comfort for wearers, and currently there are two very popular types of lenses, which differ in certain aspects. We are talking about corrective lenses and progressive lenses.

Corrective lenses: These are the ones commonly offered in opticians' shops, as the lens is designed for the personalised correction of your visual impairment. According to the result of your exam, corrective lenses are created. Whether it is for astigmatism, myopia or hyperopia, the lens is made especially for the case.

These types of lenses are the ones that are normally used, and are very functional for each person, as they are custom-made, but over time, if you have different vision problems, you will have to use several lenses for each of the problems. The formula condenses your main difficulties to avoid this, but it can happen.

Progressive lenses: If your problem is that you can't see far or near, for example, you can learn to use these lenses and have them for both uses, without the need to change, plus you can cure presbyopia, which is the tired vision that usually occurs after the age of 40 in both sexes.

One thing that can be tricky about these lenses is that you have to learn how to "handle" them, because their transition works through movement. If you look up, for example, you will see far away; objects that are in the middle distance, you will see them looking straight ahead; if you look down, you will be able to see up close.

Corrective lenses Progressive lenses
Weight Can increase according to the lens Will always be the same.
Corrections Customised Standardised
Handling Very comfortable, the eye adapts instantly Takes time to learn, but is practical
Price Affordable Can be costly

What are high-index lenses?

In terms of quality, lenses have improved over the years, and problems that may have been present in earlier models have been corrected to reduce discomfort for wearers. Problems such as weight, thickness or disproportionate magnification of the eyes in the lens reflex have been corrected.

If you are one of those who plan to invest in these improvements, high-index lenses are the right ones for you. These lenses, due to the material they are made of, allow the thickness to be minimal, resulting in lighter and more comfortable lenses for the wearer.

The way they work is simple, they deflect the amount of light your eye needs according to your optical condition, something standard corrective lenses do; however, the higher the formula, the thicker the glass becomes, so they become heavy, but this doesn't happen with high-index lenses.

Because high-index lenses are so light, you can have a wide formula without the need for these defects to occur, and they keep your eye sizes exactly as they are without the lenses, rather than increasing or decreasing them because of the increased glass.

Buying criteria

As a final point, it is important that you are aware of certain factors that allow you to evaluate and compare different lens models. The most important thing will always be the need you have. Remember that the wrong choice can make your vision worse.


The optical formula is the main thing you should have before buying your lenses, as this is the basis on which they will be manufactured in the optician's. Remember that they are not an accessory, but a corrective tool, so it is important to have an ophthalmic check-up. Remember that they are not an accessory, but a corrective tool, so it is important to have an ophthalmological check-up before making any kind of purchase.

The formula is often not understood, and it is normal, but it is important to understand what visual defects you have in each eye, so you can be more confident when buying your glasses, and avoid being sold something more expensive with things you don't need, or worse, something cheap that won't help you.

When you are given the formula, it has numbers that indicate the degree of correction that each eye needs, and this value can be positive or negative, all depending on the eye problem or condition that the ophthalmologist detected.

Positive: In case the OD (right eye) or OI (left eye) has a positive value, it indicates that you need X number (the value that appears) of adjustment to see up close. In other words, this is the score that the lens has increased to help you see at close range.

Negative: If either the OD or the OI has a negative value, then the diagnosis is the opposite of the previous one, as the number it tells you is the value that the lens adjusts to help you see at a distance.

Lenses that come with a built-in formula usually have these values, and can be cheaper, but if you don't have a very complex condition and only need a slight adjustment, you should pay attention to the values to choose the right one.

It is very common for vision to deteriorate. With the right lenses you can improve your quality of life. Clarity is two lenses away. (Photo: Free-Photos /


Depending on the material from which the lenses are made, the resistance will be greater or lesser, so you should analyse whether, in your daily routine, the lenses would be exposed to frequent falls or accidents, in order to acquire them with the appropriate resistance.

Steel: Steel frames are an excellent choice. They are modern, light and very strong, so they are perfect for daily use, either because they are exposed to falls or simply because you consider you are a bit careless, in any case, you should not worry about damage, because they will resist.

Metal: If the frame is made of pure metal, it will be lighter and stronger than steel, and metal frames are less prone to allergic reactions, something that steel, being an alloy, cannot ensure.

Plastic: An inexpensive and extremely lightweight material. With perspiration it can slip easily, so it is preferable to use it with a silicone adjustment bridge. They are not very resistant, as a strong fall can break them.

Other factors that can determine the resistance of the lens are certain safeties, such as the screws that can be present in the union of the rods with the heel of the frame. If you want maximum strength, buy them with these features to prevent early separation of the rods from the main body.

Due to so many models and designs, when choosing your optical lenses you can reflect your personality and tastes, as it is not only a tool to improve your vision, but a daily complement for you.(Photo: Dragan Grkic /


Regular lenses are designed for immediate adaptation of the eye, so they are not a major problem, but if they are constantly removed the blur can be a bit of a stunner.

Because of this, the handling of the lenses should be according to the condition, so if they are needed only for reading, they should be used only for reading, to avoid a habit of the eye to the magnification and an unbalancing defocus.

In the case of progressive lenses, the handling is a little more difficult, as the movement changes the magnification or condition of the lens. A very abrupt change can cause momentary dizziness, so in order to use these lenses correctly, you must learn to handle them calmly to avoid headaches or discomfort.

Frequent removal and insertion of lenses can stunt vision more quickly, so it's important that, if you're not going to wear them permanently, you moderate the number of times you remove and reinsert them. This is not to say that permanent wear is the best option if it is not indicated in your eye examination, as it can lead to dependence.


Depending on the condition, they will make a different correction, and this will determine the frequency of wear. A person who does not see far away is more likely to keep permanent lenses than a person who does not see near, as the latter is easier to use only when it is necessary to read or see at that distance.

To help you understand, we will explain the three common conditions that normally occur in the common population when it comes to vision impairment. Depending on the correction to be made, you will be able to know how often to use them.

Myopia: This problem means that you basically cannot see far away. This happens because of a deficiency in the shape of the eye that causes the light it receives to converge in front of the retina, and the consequence of this is that objects that are far away are blurred.

In this case the use is very frequent, and may even be fixed, as we see objects at long distances rather than short distances on a daily basis. The design for these lenses should be light and practical, with a style and strength to match your routine.

Hyperopia: In this case, instead of light converging in front of the retina, it converges behind the retina, causing you to see objects near or at close range poorly. These lenses are normally used when necessary. So-called "reading glasses".

Astigmatism: If this is your diagnosis, you are simply in the middle of the two above, and your main defect is difficulty focusing. This means that the shape of your cornea is oval, rather than round, which causes problems focusing on a single point. These lenses are usually permanent.

(Featured image photo: DariuszSankowski /