The eyes are likened to a video camera that captures an image by focusing. Light is collected by two lenses, the cornea and the crystalline lens, and an image is formed on a film called the retina, and the image is sent to the brain with a code called the optic nerve to "recognize" things. If the retina is in focus, you can see things clearly, but if you focus on the front, a blurry image will appear on the retina. This condition is called myopia.
Axial myopia caused by the axial length (length from the cornea to the retina) being too long for myopia, and the force to bend the light of the cornea / crystal (refraction) It can be divided into refractive myopia caused by too strong force, but most myopia is axial myopia. On the other hand, hyperopia is a condition in which the focus is deeper than the retina due to the short axial length of the eye and the weak refractive power of the cornea and crystalline lens. When looking closer, you have to bend the light more to focus, but in myopia, the refractive power is originally strong and the focus is in front, so it is suitable for looking closer. On the other hand, in the case of hyperopia, the light must be bent more strongly, which is inconvenient because it is very difficult to see near and focus at a distance.
Infants often have hyperopia, and as they grow up, their eyes grow larger and settle into a state of refraction that is just right. It is said that it will end. It usually starts in elementary school or junior high school and stops progressing around adulthood, but in rare cases it progresses further and causes retinal abnormalities such as retinal detachment and bleeding in the macula, resulting in poor eyesight even when wearing glasses. There is also morbid myopia.
A lie about myopia ● Is it true that reading a book in a dark place causes myopia?Lighting is very important to the eyes. Moderate brightness is required for comfortable study and reading. Reading in the dark can cause eyestrain, and when it accumulates, it can cause myopia due to accommodation tension. However, in general, myopia has a large genetic predisposition, so while some people do not get myopia no matter how bad the conditions are, others do get myopia even if they are careful.In any case, there is a tendency for myopia to occur due to lifestyle habits, so those with a predisposition to myopia should be careful about lighting.
A lie about myopia ● Is there really a way to cure myopia by making contacts while sleeping?It's about orthokeratology treatment. Wear hard contact lenses (orthokeratology lenses) with a special design on the back side every night before going to bed. Even after waking up in the morning and removing the orthokeratology lens, the shape of the cornea has been corrected for a while. Since the cornea is "cursed" into a shape that corrects myopia, vision is restored for a certain period of time until the shape of the cornea returns to its original shape even if the lens is removed. By continuing daily, the effect will continue for a little longer, and you will be able to maintain good eyesight while you are awake about two weeks after you start wearing it. Since it is not a surgery, if you stop wearing the orthokeratology lens, the deformation of the cornea will heal and you will return to the state of myopia before wearing it. Therefore, you should wear it daily to maintain good eyesight.
(Excerpt from "Ophthalmology No. 119, 3rd Edition, One Book for the Family ... Eye Medicine Box" p.126-129)
The eyes of modern people, who often see displays, are constantly being abused. In addition, with the aging of society, the problems of addictive diseases such as cataracts and glaucoma are also being highlighted. In this book, we will explain easily with Q & A about familiar eye diseases and questions that you have about your eyes. It also provides detailed information on myopia correction surgery and cutting-edge treatments.
Title: Ophthalmology No. 119, 3rd edition, one book for each family ... Eye medicine box Author name: Tomoaki Nakamura Author: Nagoya Eye Clinic, Chukyo Group Ophthalmologist Format: 46 sizes Total number of pages: 268 pages Price including tax: 1,650 circle