Adolescent Vision Protection Glasses – Myopia Control Lenses

Nowadays, an increasing number of adolescents are developing myopia prematurely due to excessive use of smartphones, tablets, or other electronic devices. When parents take their teenagers to get glasses, they often hear recommendations for myopia control lenses. Although the words are frequently mentioned, many parents remain hesitant for two main reasons: first, they don’t understand what myopia defocus lenses are and whether they are suitable for their children. Second, they are unsure about the differences between myopia control lenses and regular lenses. Additionally, parents are concerned about the cost of myopia control lenses. Today, Aogang Lenses will introduce myopia control lenses to you.

Table of Contents

What is Defocus?

The human eye can see objects clearly because the reflected light from objects is refracted by the lens and focused precisely on the retina. If the focal point is not on the retina, the vision will be blurry, which is called defocus. Myopia (nearsightedness), hyperopia (farsightedness), and astigmatism are all types of defocus. The relationship between the refractive system of the eye and the retina can be classified into three states:

Emmetropia (Normal Vision): The focal point falls on the retina, allowing clear vision.
Hyperopic Defocus: The eye’s refractive power is relatively weak, causing the focal point to fall behind the retina.
Myopic Defocus: The eye’s refractive power is relatively strong, causing the focal point to fall in front of the retina.

How Do Myopia Control Lenses Work?

Nearsighted people see images on the front side of the retina, but around the wall of the eye there will be images that still fall behind the wall and will induce the wall to continue to grow backwards. When myopia is not corrected, there is no way to stop the growth of the eye axis.

The effect of normal mono-optic lens correction. You can see clearly in the middle, but the peripheral image still falls behind the retina, which still grows towards the focal point, deepening the elongation of the eye axis. The main function is to allow clear vision.

It is necessary for the centre to be visible and for the peripheral images to fall in front of the retina, guiding the retina as close as possible to the front and not extending backwards. The increasing amount of compound defocus creates a circular myopic defocus zone, ensuring that the central area of the lens is photometrically stable while creating a myopic defocus signal in front of the retina, tugging on the eye axis to slow growth.

The Designs of Myopia Control Lenses

We have 2 designs of myopia defocus lenses, including 558 points and 940 points.

The Differences between Myopia Defocus Lenses and Regular Lenses

Regular Lenses: These have the effect of correcting myopia, allowing those with myopia to see clearly when wearing them. However, with ordinary myopia glasses, while the focal point of central vision falls on the retina, the focal point of peripheral vision falls behind the retina, creating peripheral hyperopic defocus. When hyperopic defocus occurs, the retinal tissue at the back of the eye tries to develop in a way that allows clearer vision, which can stimulate the elongation of the eye’s axial length, leading to the progression of myopia and an increase in prescription strength. Therefore, ordinary lenses can correct vision but cannot control the worsening of myopia.

Myopia Defocus Lenses: Myopia Defocus lenses not only provide the clearest correction for central vision but also design the lens power outside the central area to be lower than that of the central area. This way, images are projected onto the peripheral retina or in front of it, reducing the likelihood of hyperopic defocus and thereby helping to slow down the progression of myopia.

Conclusion: The primary difference between regular lenses and myopia defocus lenses is that myopia defocus lenses can correct myopia and control its progression, delaying the increase in prescription strength.

Cost of Myopia Defocus Lenses

Myopia defocus lenses are more expensive than regular lenses but cheaper than orthokeratology lenses (OK lenses). For bulk purchases (more than 300 pairs), prices generally range from $4.60 to $6.50 per pair, depending on the quantity. For retail prices, please contact our customer service. They will provide you with the most suitable quotation based on the required quantity and prescription.

Suitable Users for Myopia Defocus Lenses

Myopia defocus lenses are suitable for a wide range of users, and children over 3 years old can wear them. During fitting, certain conditions need to be met: