The answer may be simple.
The best sunglasses, at least in the U.S., cost a lot more than cash.
The study looked at more than 10,000 pairs of sunglasses and determined that sunglasses cost a fraction of the price of cash, and often are much more durable and comfortable to wear.
They also don’t need to be thrown out every few months, and are usually better for a longer period of time.
“The more time you invest in a pair of sunglasses, the better they are going to be for you,” said Dr. Paul T. Zimny, a professor of preventive medicine at Columbia University’s Mailman School of Public Health.
“You can go from wearing a pair to throwing them away.”
It’s a common refrain among health care workers and consumers who have long questioned the value of sunglasses.
But the research shows that it may be the right answer for some.
For instance, sunglasses that cost less than $1,000 or less than a $300 pair can be worn for a long time and still look great, Zimney said.
That’s because the lenses absorb some of the light that comes through the lens, which reduces the amount of light that hits the eye.
And even a pair that costs a few thousand dollars a pair can last more than a decade, Zomny said.
And the research found that if a patient has a chronic eye disease that prevents them from wearing sunglasses regularly, they’re likely to wear them only as long as they’re necessary.
For example, if the person has severe vision loss and can’t wear them regularly, the study found, they could wear them up to 20 years.
In general, if a person has good vision and is not able to wear sunglasses regularly enough, they will need to keep them in their eyewear drawer, Zemny said, adding that the research didn’t address how often they should wear glasses.
The American Academy of Ophthalmology recommends that adults wear glasses when they’re needed and that older adults wear them as often as possible.
But Zimnicy said the study shows that people can wear sunglasses for long periods of time, without needing to toss them out every couple of months.
“If you can wear glasses regularly and you don’t have an eye condition, you can get a pair for a very long time,” he said.
In other words, even if glasses are expensive, people should have the time and money to wear the glasses regularly.
But the study did find some exceptions to the rule.
For instance, a pair could be worn daily and not be discarded.
It’s also possible that the glasses were worn for longer periods of the day or night, and people can’t remember the last time they wore them, Zamny said.
“I think that it’s a good idea to make sure that people know that they can still wear them,” Zimnysaid.
For example, a person who wears glasses for long stretches of time might find that they become fatigued, Zamiy said.
“And that would be a problem.”
A person with diabetes, on the other hand, might need to wear glasses to control blood sugar.
And even though they’re often worn for shorter periods of days, people can lose the lenses easily, Zima said.
“A person might not have the chance to wear a pair every day for a year and a half,” Zamiysaid, who is also the lead author of a paper about the research, said.