People who often use smartphones and PCs should be careful-the first thing to do if you think "maybe presbyopia?"

"Presbyopia" is a phenomenon that makes it difficult to see at hand. Recently, with the spread of smartphones and personal computers, the number of young people suffering from these symptoms is increasing.

Continuing from the previous article (http://president.jp/articles/-/20380) that explained a simple check method for presbyopia and smartphone presbyopia, and the mechanism of why presbyopia occurs, in this article, "Maybe presbyopia?" I would like to ask Dr. Hiramatsu of Sainokuni Higashi Omiya Medical Center about what I want to do and the "city legend" related to presbyopia.

Eye structure. When looking at things, the light coming in through the cornea is adjusted with the iris, and the ciliary muscle adjusts the thickness of the crystalline lens to match the pin. "Presbyopia" is a condition in which the ciliary muscles weaken with age and the crystalline lens becomes stiff, resulting in a decrease in the ability to adjust focus. View all images (5)

What is the difference between people who are prone to presbyopia and those who are not?

The ciliary muscle becomes tense (contracted) when looking near, and the ciliary muscle loosens when looking far. Focus adjustment is required when looking closer, so if the flexibility of the ciliary muscle is impaired, it will be difficult to see at hand.

Some people are hard to see in their thirties, while others are perfectly fine after the age of 40. Some people say that they do not get presbyopia even if they are over 60 years old. Where does this difference come from?

"Basically, people who have a lot of near-sight work, that is, people who have a lot of work to look at a computer or monitor screen, should think that it is faster than usual. The longer the work to look closer, the more symptoms of presbyopia. It's easy to get strong. After that, it's easy for people who have systemic illnesses such as diabetes or are in poor physical condition. "

When people with myopia often have presbyopia, there are people who say, "I think people with myopia do not have presbyopia." However, Dr. Hiramatsu said that it was an urban legend.

"That's a mess of myopia and presbyopia. Myopia and presbyopia are completely different elements." People with myopia can see near by taking off their glasses, so they don't get presbyopia (presbyopia). (Not) ”. Originally, people with myopia have difficulty seeing in the distance, and they are not good at seeing near.”

When a person with myopia is not yet presbyopia, you can see it properly by looking at your hand with myopia glasses (easy to see in the distance). However, if you have presbyopia and look at your hand with myopia glasses on, you will not be able to see it because your ability to focus at a short distance is reduced. Removing the glasses makes it easier to see because the lens is gone and no extra adjustments are required. Depending on your progress, even if you remove your myopia glasses, you will not be able to see as close as before.

"People who believe that they have presbyopia and do not have presbyopia often insist that they cannot see it because they can see it by removing their glasses, even if it is difficult to see it unless they are separated by 30 cm or more."

The reason why you can't see your hands and resist stubbornly even if it becomes inconvenient is probably because there is a problem with the sound of the word "presbyopia". However, being invisible still causes inconveniences in daily life and work. “The more you resist, the more likely you are to lose productivity. The sooner you make your glasses, the more productive you will be,” says Dr. Hiramatsu.