Hidak and B&bit Gangnam Bright World, the story of the human eye that 4 ophthalmologists discover together. Every week we present diseases that damage your eyes and different ways to keep your eyes healthy.
About 1.17 million people. The number of myopia patients in 2019 according to data from the Health Insurance Review and Assessment Service. Glasses and lenses are the representative methods for correcting nearsightedness, where it is difficult to see close objects but far away. Director Kim Joo-hyunLet’s dig into the misconceptions and truths about these glasses and lenses one by one.
Wearing GlassesㅣSource: Getty Images Bank
5 Glasses Myths
1. Poor eyesight due to negative vision?
I often hear the saying “Your vision is negative.” However, this is an incorrect representation, and vision is not expressed as a negative number. Visual acuity refers to distance vision, which is measured by having people read letters from a distance. Visual acuity is expressed as a decimal number, and when there is no vision, it is called 0.0. The higher the number, the better your vision. For example, a visual acuity of 1.0 means good vision and is considered normal vision.
On the other hand, there is the concept of frequency. Power refers to the strength and power of the lens required to correct the eye. The degree of poor vision is expressed as the power of myopia. Thus, in ophthalmology, information is displayed and communicated primarily by myopia rather than visual acuity. When ordering glasses, the prescription for glasses is also written on the myopia power, not the visual acuity. Nearsightedness is indicated by – (minus), and farsightedness is indicated by + (plus). The frequency can be negative.
2. Is it bad for your eyes if you wear glasses with lots of scratches on the lenses?
Scratches on the lenses that occur when wearing glasses increase eye strain. In addition, the function of the lens coating deteriorates, so it cannot block UV rays well. When the UV protection entering the eye is reduced, it can cause damage to the cornea. Therefore, although there is no exact specific interval for changing glasses, on average, it is recommended to change them once every 1 to 2 years.
3. Is it bad for young children to wear glasses?
Even infants under two years of age may be advised to wear glasses if significant myopia is detected. This is because proper visual stimulation is required for the development of proper vision. The younger you are, the faster your eyes will heal and the more effectively you can correct your vision.
There are many parents who misunderstand that their eyes are getting worse because they wear glasses when they see that the power of glasses rises every time their child has an eye exam. However, these are just natural changes that occur during growth, and glasses do not make your eyes worse. However, if you wear over-correcting glasses for a long time, the lens control stimulus increases when working at short distances, which could worsen myopia.
Vision loss is caused by eye growths or abnormalities, not glasses. Myopia has a big impact on children and young people growing up, so it is recommended that children check if their vision has changed every 6 months to 1 year.
4. My eyesight is bad, but if I don’t wear glasses, does my eyesight get worse?
Not wearing glasses does not make your vision worse. There can be many reasons for poor vision, including congenital factors, cataracts, retinal detachment, and glaucoma. It doesn’t matter if you wear glasses or not. So, if you have bad enough vision to feel uncomfortable in your everyday life, wearing glasses is recommended, but if you don’t have any major problems, you don’t necessarily need to wear glasses.
However, proper eye care is essential. This is evidenced by research results which suggest that when vision is reduced, sensory experience is poor, the quality of visual information received by the eye is reduced, and cognitive load can occur by filling in the gaps in visual information.
5. Does your vision deteriorate if you only wear your glasses when you need them and take them off?
Wearing glasses only when necessary does not mean that your vision gets worse due to nearsightedness or astigmatism. This is also true in children. Myopia is worse because the eyeballs grow as the body grows, so the habit of wearing glasses does not affect the growth of the eyes. So, you can wear glasses as comfortably as you want. Wearing glasses only when necessary does not lead to reduced vision such as nearsightedness or astigmatism.
Soft LensㅣSource: Bright World Ophthalmology B&bit Gangnam
5 contact lens myths
1. What is the difference between the power of contact lenses and the power of glasses?
Even if the vision is the same, glasses and contact lenses have different powers. This is because the distance between the glasses and the eye is 12 to 15 mm, but the contact lens touches the eye directly, so there is very little distance between the eye and the lens. Therefore, if you adjust your contact lenses to the power of your glasses or your glasses to the power of your contact lenses, you may experience dizziness due to the difference in image magnification.
2. Can myopia, farsightedness, and astigmatism be corrected by wearing lenses alone?
Contact lenses can correct nearsightedness, farsightedness and astigmatism to some extent. However, even if nearsightedness and farsightedness are corrected with lenses, if astigmatism is not corrected properly, clear and distinct vision cannot be obtained. Regular astigmatism can usually be corrected with glasses or contact lenses for astigmatism. However, severe irregular astigmatism is difficult to correct. In this case, it is recommended to focus on the correction of astigmatism with astigmatism correction glasses, astigmatism correction contact lenses, or dream lenses through a detailed examination.
3. Proteins and deposits on soft lenses, shouldn’t they be left alone?
Soft lenses are made from soft materials such as hydrogel and silicone and have a good fit. Its advantages are that it is cheap and has a wide choice of designs and materials. However, because it covers the entire eye, the low oxygen permeability is a disadvantage. If you use it for a long time, our eyes lose a lot of moisture and become very dry. This can increase the risk of other eye diseases.
Also, the surface of the soft lens is easy to scratch. Scratched lens surfaces can cause protein or bacterial deposits. If you continue to wear lenses that are coated with protein, a component of tears, your vision may deteriorate or your cornea may be adversely affected. Therefore, it must be cleaned regularly to remove protein deposits.
On the outside of the soft lens product, the replacement cycle is written, such as one day, one month, or six months, depending on the lens. You can change the lens according to each reset cycle. It is also recommended to carefully check the condition of the lens during use. If your lenses are scratched, have protein deposits, or are difficult to see with your lenses on, we recommend changing them quickly.
4. Can I use hard lenses for more than 2-3 years?
Hard lenses are designed to float over the eyes rather than cover the entire eye. They are smaller than soft lenses and have excellent oxygen permeability to reduce eye fatigue. The lens moves when you close and open your eyes, which makes it less dry. The diameter is as small as 9-10mm, and the clarity is excellent, and the astigmatism correction effect is excellent. The price is high, but after purchase, it can be worn for 2-3 years, which is economical. However, unlike soft lenses, they are not as comfortable to wear and can take up to a month to get used to.
The average replacement cycle for hard lenses is usually 2-3 years. However, if the condition of the lens is clean during the period of use and there is no problem with vision correction, it is better to use it according to the situation. In addition, check the condition of the lens thoroughly when using it and pay attention to cleaning and disinfection.
5. Can I wear colored lenses all day?
Colored lenses have low oxygen permeability, so oxygen is not properly supplied to the cornea. This makes the eyes dry and tired easily. In particular, the problem with the dye has a bad effect on the eyes. In addition, since the surface is uneven compared to normal lenses, bacteria adhere to the surface of the lens more easily, which can cause inflammation such as keratitis, conjunctivitis, and corneal ulcers. Colors for cosmetic purposes can cause problems with the lens, increasing the chance of developing diseases such as cataracts and glaucoma.
Therefore, it is not recommended to wear colored lenses that do not have high oxygen permeability for a long time. If you want to wear colored lenses in a healthy way, the solution is to wear them for less than 4 hours a day and keep them clean using a lens preservative.