Progressive lenses, referring to multi-focal lenses, are widely worn in Europe and the United States, but have only become popular in China in the past 10 years. Let's look at a picture of progressive multifocal glasses.
Nowadays, many people have worn progressive multifocal glasses, and progressive glasses have become commonplace.
However, not everyone can get the ideal progressive glasses. Many people with the first time, they do not want to match, the reason is nothing more than to wear uncomfortable, spend more money, but did not reach their expectations.
The design of progressive multi-focal lenses can also be classified into internal progressive and external progressive. The technology and experience of progressive lens fitting will also affect the wearing experience. Therefore, understanding the design of lenses can help you get more comfortable glasses.
Inside progressive and outside progressive concepts
Outer progressive lens: The gradual design is all on the outer surface of the lens, and the prescription is processed on the inner surface of the lens.
The progressive design of the external progressive piece fixed has obvious disadvantages, which can not be customized according to the individual needs of the eye, and the design and processing is more traditional.
Inner progressive lens: The gradual surface is located on the inner surface, and the vertical aspect is also located on the inner surface.
Since the back surface can be designed and processed flexibly, the gradual luminosity and prescription luminosity can be optimized according to each person's prescription, wearing parameters and personal visual habits, so as to improve the visual experience of the wearer.
Inside progressive and outside progressive distinction
Visual field width: The inner progressive visual field is wider
Because the progressive surface of the inner surface is closer to the eyeball, wearing this lens can increase the wearer's visual Angle, improve the width of the central viewing area and the visual utilization of the surrounding area, and the imaging effect is more realistic and clear. Compared with the progressive surface of the outer surface, the visual field increases by about 35%.
Near comfort durability: inside gradual wear more comfortable
The inner progressive adopts unique technology, which makes the lens deformation smaller than the outer surface progressive, and the aberration area is closer to both sides of the lens, and the deformation area of visual interference is smaller, so the wearing comfort is greatly improved, and the adaptation is faster.
Backspin requirements: Each has its advantages
For customers with good eye backrotation ability, the gradual adoption of low ADD value or long channel is the best. For customers with poor backrotation ability, high ADD value or short channel progressive use of external progressive optimal.
Customized requirements: Internal progressive can be personalized design
The parameters of the inner progressive lens can be comprehensively optimized according to the needs of the eye degree and the use habit, which means the glasses customized for customers are more in line with the actual wearing needs of customers.
Big hot trend: internal gradual more meet demand
Nowadays, due to the improvement of people's quality of life, the phenomenon of eye fatigue is significant, and presbyopia shows a trend of younger age. Therefore, under the condition that the cyclotral force of the eye muscle is satisfied, internal gradual is the priority choice to meet the needs of customers for broad vision and improve satisfaction.
Cause of discomfort in wearing the progressive piece
In daily wear, there are also some causes of progressive lens wear discomfort as follows
1. Lens stain
Glasses in daily use a little attention will be contaminated with dust stains, affect vision; Scratched lenses can also interfere with the passage of light, resulting in blurred vision and discomfort.
Suggestion: The glasses should be cleaned during use. Wash the lens grime with water, and then gently wipe it with a clean and soft eyeglass cleaning cloth to avoid scratches. If the lens has many scratches, it should be replaced in time.
2. Deformation of mirror frame
Glasses used for a long time will inevitably be squeezed, pulled, distortion and deformation of the frame. If the optical center of the lens cannot be directly toward the pupil, deviation may cause damage to the eye and decrease visual comfort.
Suggestion: The glasses should not be put in the pocket or bag at will, but should be stored in the mirror box and kept properly. If it is found that the distortion of the mirror frame can not "make do", it is necessary to ask professionals to adjust and maintain in time.
3. The matching is not suitable
In addition to the degree of myopia and presbyopia, the daily use after wearing should also be taken into consideration. The professional degree of the tester and the quality of the lens are required to be very high. Improper fitting of the tester is easy to cause discomfort.
Suggestion: Be sure to choose a regular, qualified eye hospital or optician, by a professional optometrist.
Post time: Oct-17-2022