You can either blow the dust off the lenses or wipe them with a soft cloth - your preference
It is moisture in their breath that helps cleaning
Blowing air on spectacles helps remove any loose dust or debris, making it easier to clean the lenses without scratching them. It can also help prevent smudging when you wipe the lenses clean afterward.
Opticians are people who have the sufficient knowledge to test for eye disorders, recommend and sell spectacles to people.
as the air inside the car cannot escape from a closed atmosphere the cool air inside the car is condensed in the form of water vapour in the spectacles.
"Specs" is an informal word for spectacles, although many people don't use the word at all, and use "glasses" instead.
Yes, but you cannot become a pilot.
why does ac blow warm air? why does ac blow warm air?
An air conditioner blows out heat
if the heater does not blow out warm air change the setting.
For optimal ventilation, it is better to blow air out.
Do spectacles help me? yes. Without them i can't see well. Can't see people's facial expressions, recognise people, can't see water reflections clearly...
Hot air because it is blow out the hot air from the inside of the laptop.