Touted to enhance nighttime eyesight, yellow lens glasses don’t assist drivers see higher and will, in reality, worsen imaginative and prescient, a brand new examine suggests.
Researchers discovered that yellow-lens carrying volunteers working a driving simulator had been no higher at recognizing a pedestrian when confronting oncoming headlights than those that wore clear lenses, based on the examine revealed in JAMA Ophthalmology. And there was a suggestion that the yellow tinted lenses would possibly even be making the state of affairs worse.
Consumers of those merchandise “have the idea that one way or the other these magic glasses can enhance nighttime driving,” mentioned the examine’s lead writer, Alex Hwang, an teacher in ophthalmology on the Harvard Medical College and an investigator on the Schepens Eye Analysis Institute at Massachusetts Eye and Ear. “Carrying (tinted) glasses, whether or not they’re yellow, purple or blue, cuts out a piece of sunshine. Which implies this is similar as carrying sun shades whereas driving at night time.”
Hwang’s recommendation: “Don’t waste your cash on these sorts of glasses for night time driving.”
Regardless of there being no proof of effectiveness, yellow-lens glasses are bought broadly, Hwang famous.
An advert for one model of yellow-lens glasses bought on Amazon claims that “night time imaginative and prescient glasses assist cut back night time driving glare and eye pressure, yellow lenses assist to boost night time imaginative and prescient, enhance coloration readability and optical definition, allow to see higher when driving at night time or cloudy, wet days, making night time driving safer and simpler.”
To find out whether or not yellow-lens glasses might truly enhance drivers’ night time imaginative and prescient, Hwang and his colleagues arrange an experiment utilizing a specifically designed driving simulator that included the choice of vibrant oncoming headlights.
The researchers recruited 22 volunteers who, carrying both of three manufacturers of yellow-lens glasses or clear glasses, accomplished a complete of eight night time driving situations, every of which lasted about 10 minutes. Of the 22, 18 had been youthful, with a mean age between 27 and 28, whereas the opposite 4, all males, had a mean age of 70.
Throughout the experiment, volunteers had been instructed to press the horn as quickly as they noticed a pedestrian. Pedestrians had been clad in both a darkish blue navy shirt or an orange shirt. In some runs, the volunteers had been subjected to vibrant headlights and in others they had been “driving” at midnight.
Whereas glare from headlights did appear to gradual the velocity with which the youthful group noticed the pedestrian, carrying yellow-lenses didn’t enhance issues. In truth, the yellow lenses appeared to gradual their response time, however that discovering was not statistically vital. The findings had been comparable among the many older volunteers, however their total response time was slower than that of the youthful volunteers each with and with out the yellow lenses.
Dr. Douglas Frederick hopes drivers pay attention to the findings. “The largest difficulty is that we don’t need individuals to have a false sense of safety as a result of they’re utilizing one thing that doesn’t (enhance imaginative and prescient),” mentioned Frederick, deputy chair of training within the division of ophthalmology on the Icahn College of Drugs at Mount Sinai/New York Eye and Ear Infirmary. “Motorized vehicle accidents involving pedestrians are a standard downside.”
An necessary secondary discovering is that “older individuals are extra delicate to headlight glare in comparison with youthful individuals,” mentioned Robert Masoff, a professor of ophthalmology on the Johns Hopkins Eye Institute and writer of an editorial that accompanied the brand new examine. “It is a actual downside that must be addressed.”
The rationale older individuals are extra delicate to vibrant headlights is that “modifications happen in individuals’s lenses with getting old,” Masoff mentioned. These modifications result in extra glare, he defined. “Glare can cowl up what you’re making an attempt to see. It’s like having a grimy windshield. Cataract surgical procedure could make issues higher for individuals, however that examine hasn’t been performed but.”