​How Do We Perceive Objects Clearly?

How Do We Perceive Objects Clearly?

The eye is an organ capable of perceiving light, possessing a complete and delicate optical structure. When external light enters the eyeball, it undergoes a series of refractions and adjustments by the cornea, aqueous humor, lens, and vitreous humor, eventually focusing on the retina. The light-sensitive cells on the retina convert light signals into electrical signals and transmit them through the optic nerve to the brain. The brain then performs complex integration and analysis of these signals, resulting in the external images perceived by the brain. Through this process, we are able to perceive objects in the outside world.

Is Visual Decline Equivalent to Myopia?

No, visual decline can be caused by various factors, and myopia is just one of them. Visual decline may be caused by factors such as central retinal artery occlusion, retinal detachment, and corneal lesions. When experiencing visual decline, one should promptly visit a hospital for examination to rule out diseases affecting vision and not automatically assume it is myopia.

Does Wearing Glasses for a Longer Time Increase Myopia?

This view is incorrect. Wearing appropriate glasses will not increase myopia. If the degree of myopia continues to increase after wearing glasses, it is because the factors that contribute to the progression of myopia (such as excessive close-up work) still exist. Therefore, even after wearing glasses, it is essential to pay attention to eye habits and hygiene to prevent further worsening of myopia.

Can Myopia be Cured?

Myopia is a refractive state of the eye. Although it is not a disease, it can only be improved and controlled, and it cannot fully restore vision to the state before myopia. Currently, myopia can be corrected through methods such as spectacle lenses, orthokeratology lenses, or surgery. However, we can delay the progression of myopia through proper methods.

What are the Treatments for Myopia Correction? Can Myopia be Completely Cured?

The purpose of myopia correction is to change the refractive power of the eye through surgery. The main methods include laser corneal refractive surgery and intraocular lens implantation surgery. These surgeries are mainly suitable for individuals over the age of 18 with stable myopia and must be strictly screened and implemented according to the contraindications and indications for each type of surgery. Surgery is just one method of correcting myopia and cannot completely cure myopia or prevent its complications. Therefore, one should have a rational understanding of myopia correction and approach it with a normal attitude.

What is Orthokeratology (OK) Lens? What is its Function?

Orthokeratology (OK) lenses utilize the plasticity of the cornea. Using reverse geometry-designed lenses, the central corneal curvature is changed, altering the corneal refractive power and temporarily reducing the degree of myopia. This effect can be maintained for about 10 hours. It is essentially a type of rigid gas permeable contact lens that, when worn, temporarily reduces a certain amount of myopia by decreasing the curvature of the central cornea. It is a reversible non-surgical physical correction method. Typically, myopic individuals wear orthokeratology lenses during sleep, allowing them to have good vision during the day without using any other devices.

What are Effective Exercise Methods for Protecting Vision?

Sports such as table tennis, badminton, basketball, and martial arts involve continuous up and down eye movement and near-far adjustment, allowing the muscles controlling the eyeballs to receive sufficient exercise. This helps alleviate eye muscle fatigue caused by reading and other close-up work. In particular, sports like badminton and table tennis involve constantly changing the speed and direction of the ball, requiring continuous eye adjustments and alternating contractions and relaxations of the ciliary muscle. This not only relieves eye fatigue but also enhances the accommodative ability of the visual system, contributing to the prevention and control of myopia.

Are There Any Precautions for High Myopes During Exercise?

Individuals with high myopia should avoid participating in activities involving severe or impact-related head movements, such as soccer, basketball, diving, and weightlifting, to prevent retinal detachment. They should engage in sports suitable for their physical condition and monitor their health status during exercise.