In order to see up close, the ciliary muscle tightens and the crystalline lens thickens. However, wearing nearsighted cheapest eyeglasses for a long time to see up close intensifies eye regulation. The ciliary muscle tightens for a long time, causing the crystalline lens to remain in a thickened state, in order to bring the focus that falls behind the retina back to the retina.
When we wear the cheapest eyeglasses to see up close, if we can see clearly without glasses at 50cm, but still wear glasses, or if we have a refractive error of 200 degrees and wear glasses at 300 degrees, and our eyes do not self regulate, myopia becomes hyperopia and we cannot see clearly. Therefore, at this time, our eyes need to use the adjustment function to see more clearly.
During the adjustment process, the crystalline body will thicken again, and then the axial length of the eye will increase again (referring to the principle of true and false myopia, the principle of axial length). After solidification, we will have difficulty seeing clearly again, so in order to see clearly again, we must replace the cheapest eyeglasses lens with a higher degree. You should understand the reason for the increase in myopia by now!
But over time, the ciliary muscle spasms due to excessive fatigue. At this point, when looking far away, the crystalline lens cannot immediately relax and become thinner. Therefore, when looking far away, the focus falls in front of the retina again, and the distance becomes less clear, resulting in insufficient myopia.
At this point, when looking far away, you need to immediately restore clarity. By changing to a pair of nearsighted glasses with deeper depth, you can immediately bring the focal point in front of the retina back to the retina.
