What kind of glasses are bifocals?
Bifocals are mainly used in presbyopia correction, providing presbyopic opticians with a clear vision for both near and far use in one pair of glasses. The bifocal lens can be divided into two separate areas, with the upper part of the lens providing clear distance vision and the lower part providing clear near vision. The two regions of the bifocal lens provide different refractive forces, and the difference between these two refractive forces is the reading proximal addition, which compensates for adjustment during presbyopic reading.
Wooden frames are becoming more and more popular. As a material, wood is lighter, and it provides warmth, both in appearance and on the skin. These frames stand out in a relaxed, natural way. They have dark stripes, black temple tips, and spring hinges.
Design principle of progressive multifocal lens
For the same piece of the lens, the top is used to see far, the bottom is used to see close. The upper and lower degrees are different.
There is not a sudden change in the distance degree fixed above the lens to the near degree fixed below the lens, but a gradual transition between the two through gradual changes in refractive power, which has special benefits over common bifocals or trifocal lenses.
The surface of the lens is coated with a layer of anti-fogging top film. The anti-fogging function of the lens can be activated by wiping the lens with a professional anti-fogging lens cloth, which can achieve a better anti-fogging effect. Choose this anti-fogging lens and wipe it with the corresponding anti-fogging lens cloth. IT is easy to use, and the anti-fogging effect is ideal, used for a long time. They cannot be wiped and washed.
Testing of aspheric lens
The optical axis of the optical center just overlaps with the visual axis of the eye, which is the most ideal state. Because the light from the edge cannot form a focus on the optical axis, when the optical axis does not overlap with the visual axis (the difference is greater than 2mm), such unclear and scattered imaging results will occur. When choosing frames and aspheric lenses, you need to ensure that they fit correctly, to achieve the best visual and decorative effects. Simply put, due to the special design of the lens, we found through a calculation that the optical center should move down 1mm higher than the pupil for every 2° increase in front inclination angle. Otherwise, the wrong pupil height will cause the lens to look like astigmatism, and cause discomfort. For glasses with aspheric lenses, there must be an inclination angle after wearing. The specific angle varies from person to person.
Where can use the glasses emoji?
Glasses emojis are commonly used in glasses-related social media posts and are used to refer to things that have a point of view or demand only a little direction (for example, a museum exhibit, a movie, or a beautiful viewing platform). Although glasses have become a hot fashion accessory in recent decades, they still mean bookish or clever to a certain extent.
Discountglasses.com once advertised a free try before you buy home audition kit for RX contact lenses, and the companies will send you two pairs already fitted with your own prescription lenses.Discountglasses.com now provides a virtual try-on program. Discountglasses.com provides free returns. You can safely order glasses to try on at home. The frames come with standard, high-quality 1.49 plastic lenses with a protective coating that protects the lenses from scratches and are prescribed between +/ -3.00.