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Historical Background
The concept of progressive multifocal lenses was first proposed by Owen Aves in 1907, inspired by the shape of an elephant's nose. This type of lens has a high usage rate in Europe and America, and has gradually become popular in China in recent years.
Through the above description, we can comprehensively understand the definition, characteristics, usage methods, and historical background of progressive lenses, which can help us better choose and use this vision correction tool.
Characteristic
Multi focal design:
Progressive lenses have multiple focal points on the same lens, gradually changing from the far zone to the near zone, avoiding the obvious boundary lines of traditional bifocal lenses and reducing visual jumping and wearing discomfort.
High comfort:
The wearer does not need to frequently adjust the focal length, reducing visual fatigue and eye adjustment burden, and improving the comfort of wearing.
Wide applicability:
Suitable for people with vision problems such as farsightedness, myopia, and presbyopia, especially for middle-aged and elderly people over 40 years old, students who use their eyes for a long time, and white-collar workers.
Usage and Precautions
Adaptation period:
It may take about a week to adapt to wearing progressive lenses for the first time, during which you may feel dizzy. It is recommended to start with static activities and gradually transition to dynamic activities.
Correct use:
Long distance zone: When driving or looking, slightly retract your chin and keep your head level, looking through the center of the lens slightly higher.
Mid distance zone:
When viewing a computer screen, look slightly lower in the middle of the lens and adjust the neck position slightly until the image is clear.
Close range area:
When reading a newspaper, place it in front of you, slightly extend your chin forward, and adjust your gaze downward to the appropriate mirror area 4.
Avoid using blurry areas:
The areas on both sides of the lens are areas of varying brightness, and the field of view is relatively blurry. It is recommended to rotate the head and eyes as much as possible for clear viewing.
Frequently Asked Questions
What is the origin of progressive multifocal lenses?
The concept was first proposed by Owen Aves in 1907, inspired by the unique shape of an elephant's nose. Today, they are widely used in Europe, America, and increasingly in China.
How do progressive lenses differ from traditional bifocal lenses?
Progressive lenses feature multiple focal points on a single lens with a gradual transition from far to near zones. This design eliminates the visible lines found in traditional bifocals, reducing visual jumping and wearer discomfort.
Who are progressive lenses best suited for?
They are suitable for individuals with vision issues like myopia, farsightedness, and presbyopia. They are especially beneficial for people over 40, students, and white-collar workers who experience prolonged eye strain.
How long does it take to adapt to progressive lenses?
First-time wearers typically need about a week to adapt. During this phase, mild dizziness may occur, so it is best to start with static activities before moving to dynamic ones.
How should I look through different areas of a progressive lens?
For long distance, look through the upper-center area with your head level. For mid-distance (like screens), look slightly lower through the middle. For close reading, lower your gaze to the bottom zone and slightly extend your chin.
Why does the vision look blurry on the sides of the lenses?
The outer sides of progressive lenses are areas of varying aberration, which naturally creates a blurrier field of view. To see clearly on either side, it is recommended to turn your head rather than just moving your eyes.