Reason why you see so many celebrities wearing red glasses now as Robert Downey Jr sports them during Oscars ceremony

Eagle-eyed viewers of this year's Academy Awards may have noticed Robert Downey Jr - one of the show's presenters - wearing a rather obscure-looking piece of eyewear.

Strutting onto the stage to present Kieran Culkin with the Oscar for Best Supporting Actor for his role in A Real Pain, the Hollywood veteran was seen donning some red tinted sunglasses.

I know, right? Odd choice for a totally indoor ceremony that starts in the afternoon...

Apparently, however, the reasoning for these specific-coloured glasses is notorious in the entertainment industry.

And if you look closely at several star-studded, red carpet appearances recently, you'll likely have noticed that these red-tinted glasses are on the rise with A-listers.

One video shared recently by @sleeptints on Instagram explained this 'good reason', stating: "They're an incredible tool for improving sleep and recovery. The secret lies in how they block harmful artificial light, specifically blue, green and ultraviolet wavelengths."

The post continued: "These are the types of light that disrupt your body's production of melatonin, the hormone responsible for regulating your sleep cycle.

"Deep, restorative sleep allows bodies to repair muscle tissue, lower cortisol levels, and recharge energy for the next day."

So, essentially, the red-tinted glasses can allegedly help people wind down naturally - something which is worth its weight in gold.

Elton John has been seen wearing the same glasses (RB/Bauer-Griffin/GC Images)

Oliver Omura, the founder of Specs Collective, offered an alternative take - making it less about ease and more about age.

He told the Wall Street Journal: "I think it helps for older gentlemen who want to maybe hide some of their eyes that make them appear a little older."

Though, of course, it's not just aging stars such as Robert Downey Jr. and Elton John opting for the lenses, the likes of Selena Gomez and Drake have also sported them - with the latter rapping in a song 'Got the rose pink-tinted lenses, it’s a Wednesday', upping their cool level by approximately 200%.

"I definitely do see [coloured lenses] as a trend, particularly with older people looking to kind of spruce up their game," says Ashley Bezamat, owner of Dom Vetro.

The owner of a brand, Fabulous Fanny’s, Bob Hillman, said 'the colour of the lens and the pigment of the lens impacts the quality of what you see and how you see'.

Pharrell Williams has been seen in similar eyewear (MEGA/GC Images)

Pointing to pilots as an example, he added that they often opt for green or grey tinted lenses as they 'enhance vividness and minimise scattered (blue and violet) light.'

The more you know, eh?