Why do I see rings around lights? | KOALAEYE OPTICAL

Why do I see rings around lights?

The frame of prescription glasses

At present, the more common materials for frames are non-metal and metal. Non-metals mainly include TR90, sheet material, etc., and metals include alloys, titanium, and so on. TR90 and sheet material are actually plastics, but they are firm and are not easy be deformed at room temperature. Also, they have good formability so that they can be made in many fashionable styles. The general alloy material has good firmness and flexibility, but the disadvantage is that it is easy to fade. The pure titanium frame is corrosion-resistant and very strong. It is about 40% lighter than the general alloy frame. It must be welded and electroplated in an oxygen-free state, which requires high equipment and technology. Relatively speaking, the price of TR90 and alloys will be lower, and pure titanium will be more expensive. You can choose according to your budget.


Why are titanium glasses so expensive?

Light Weight. The term 'pure titanium' means a titanium metal material with a purity of more than 99%. A mineral containing titanium was found in 1791, but pure titanium was not produced until 19. Pure titanium glasses are lighter than titanium alloy glasses. For frames of the same design or appearance, titanium frames weigh only half as much as other ordinary metal frames, reducing the load on the bridge of the nose.



Types of Adjustable Glasses

Adjustable glasses come in different types including adjustable reading glasses, adjustable focus glasses and adjustable focus reading glasses.

Adjustable reading glasses have an adjustable focal length and compensate for refractive errors. They provide variable focusing so you can adjustable them for desired distance and prescription. They are often used for reading because you do not need to adjust the position of your eyes.

Adjustable focus glasses offer an adjustable focal length. They are used to correct refractive errors including presbyopia. They provide variable focusing so as to adjust the glasses for seeing things close up or far away.

Adjustable focus reading glasses are the same as adjustable reading glasses. You can adjust the dials of the glasses so you do not need to reposition your eyes to see objects clearly in the near or far.


Study On the Night Driving Glasses

Researchers at Harvard's Schepens Eye Research Institute recently conducted a study to find out if wearing night driving glasses while driving at night is good for vision. All 22 participants drove under four conditions that simulated night driving, wearing either yellow night driving glasses or glasses with clear lenses. Each participant drove with or without the headlight glare simulator activated to simulate the effect of oncoming traffic. The study found that wearing glasses while driving at night didn't seem to improve: how well the participants were able to recognize pedestrians at night and negative effects of headlight glare on pedestrian detection. Our data suggest that wearing yellow lenses while driving at night does not improve performance at the most critical task: pedestrian detection, the study's authors said. A small 2019 study showed that night driving glasses can actually slow down visual reflection by a fraction of a second, making night vision worse.



What Are High-Index Lenses?

High index lenses are eyeglasses lenses that are designed to be thinner and lighter than regular lenses. High-index lenses have a high refractive index than their conventional counterparts. So, they are generally recommended for people who have significantly high refractive errors and strong prescriptions for nearsightedness, farsightedness or astigmatism.

High-index lenses correct all types of refractive errors. And they are also available as single vision lenses, or a reading prescription that corrects presbyopia, such as in a bifocal or progressive lens.

High-index lens has a higher refractive index and which is ranging from 1.53 to 1.74. A lens with an index of 1.74 could be up to 50 percent thinner than a regular plastic lens with an index of 1.50.


The Advantages of Trifocal Lenses

The greatest advantage of trifocal lenses is that they have three prescriptions in one, which means that not only do you not have to buy three separate pairs of glasses, but you also won’t have to constantly change them as you go about your day.

Another advantage of trifocal lenses is that in some cases, they offer a broader viewing area for near and intermediate-distance applications like reading and using the computer.


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Polygonal metal frame

The metallic frame that is full of contemporary and retro feeling still did not end curtain. Stylish people like to use it to match modeling nowadays.

Vintage oval frames

It's a pair of glasses with a retro, '90s-like frame feels that's very popular with hipsters. They are retro with a little cool cute.

The cat-eye style

The cat-eye style can be seen in the changing history of eyewear trends as far back as the 1940s. Flying nifty cat-eye has been unable to show the stage. But times have changed, and the styles of cat-eye have become more varied. Some brands provide multiple types of cat-eye glasses, showing different atmospheres and domineering.

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