Advantages and disadvantages of multifocal glasses

Nowadays, more and more people suffer from myopia, which means that the market for glasses is also very broad. There are many kinds of glasses on the market today, their functions are becoming more and more diverse and detailed, and their prices vary. Everything in the world has two sides, so glasses are no exception. They have advantages and disadvantages. Today, I will introduce to you the advantages and disadvantages of multifocal glasses. Let's learn about them together.

Principle of multifocal glasses:

The principle of progressive multifocal lenses is applied to glasses. The far light zone and the near light zone of the same lens are organically connected together by gradually changing the diopter from far diopter to near diopter. Therefore, one lens can have different light powers required for seeing far, medium and near distances.

Advantages of multifocal glasses:

1. The lens looks like a single-vision lens, and there is no visible dividing line for changes in power. Not only does it look beautiful, but more importantly, it protects the wearer's age privacy, so there is no need to worry about revealing the secret of age due to wearing glasses.

2. Since the change in lens power is gradual, no image jump will occur. Comfortable to wear and easy to adapt to. So it is easily accepted.

3. Because the degree is gradual, the replacement of the accommodation effect also increases gradually as the near viewing distance shortens. There is no fluctuation in accommodation, and it is not easy to cause visual fatigue.

4. Clear vision is available at all distances within the visual range. A pair of glasses can be used for distance, near and all distances in between. This is especially good news for teachers, doctors, music workers, and computer operators, because these people not only need to see objects clearly near and far, but most of the time they also need to be able to see objects in the middle distance such as blackboards, piano scores, computer screens, etc. This is something that cannot be done with lenses other than progressive multifocal lenses.

5. Currently, domestic and foreign ophthalmologists unanimously recommend that "teenagers wear low-power convex lenses when reading and writing to reduce near-vision adjustment, thereby alleviating or preventing the occurrence and development of myopia." This gives progressive multifocal lenses a new meaning and mission. Physiology has found that excessive use of the eye's accommodation function can cause "accommodation spasm" or pseudomyopia. Continuing development can result in longitudinal elongation of the eye axis, inducing "true myopia" or axial myopia. The external power of progressive lenses can artificially add progressive power. Use the deep power at the top for distant vision and the shallow power at the bottom for near vision, so that the eyeball can relax and adjust excessively. The constantly changing lens brightness replaces the "accommodative power" that should have been enabled, blocking the vicious cycle of accommodation-eye axis lengthening, making the eye less prone to fatigue and slowing down the development of myopia.

shortcoming:

When you first wear progressive multifocal glasses, you may experience the following: slight dizziness, unsteadiness when walking, and caution when climbing stairs. The sense of space changes, the judgment of the distance of objects, and the sense of depth change. People who wear it for the first time should not drive or do strenuous exercise immediately. When looking at close objects, the eyes need to turn downward, causing slight discomfort in the eyes. Objects appear blurry when viewed through the blurred vision zone at the periphery of the lens. Therefore, when first-time wearers look at things, they should move their heads more and their eyes less, and try to use the distance, near, and medium-distance areas to look at objects.

Note:

1. You may feel uncomfortable in the early stage of use, such as eye swelling, eye fatigue, dizziness, etc. This is a normal phenomenon and will generally disappear within a few days.

2. Contraindicated for use in patients with glaucoma, eye trauma, acute eye disease, and hypertension.