Glasses, and glasses for nearsightedness above all, are not a therapy. They do not improve, stop or slow down nearsightedness. On the contrary, if they are used improperly (i.e. in circumstances when they are not necessary) they make nearsightedness worse. That is true especially for teenagers, but it applies also to people in their 20s.
So the answer to your question is : wear them only when needed. Absolutely never for close work, that would be the worst thing of all despite what Braniac says, and it's obvious that he's out of his mind when he says "use them especially for reading". Nearsighted people can see close things better and with less effort that people with perfect eyesight. The use of glasses for close distance is pure madness.
Since you are only moderately nearsighted you can get your eyesight back without surgery, but it won't be neither fast not easy. I had a 3.75 nearsightedness ( which was much ,much higher than yours) and so far I've reduced it to 1.75 by following a visual training method which cost me almost no money but a lot of time and patience. That's why most nearsighted people will always prefer the immediate clear vision offered by glasses, contacts and surgery.
Since you started wearing glasses only recently, it's possible that at least a part of your condition is caused not by nearsightedness (myopia) but by pseudo-myopia, which is much easier to resolve because it's just a spasm of the ciliary muscle ,while myopia consists in the abnormal length of the eyeball. That spasm is often caused by too much time spent looking at too short a distance and it often happens to avid readers, students, computer users and so on.
This is the method I used: https://www.amazon.com/Secret-Perfect-Vision-Prevent-Nearsightedness/dp/1556436777/ref=sr_1_1?tag=ahai-20
Dear Braniac, I'm sure of your good intentions, but you are wrong as are wrong the most common ideas about myopia. Myopia is probably the most neglected field in medicine. The things taught about it even in the most important medical school in the world are still the same of a century ago. Have you ever noticed that as soon as one starts wearing glasses (and using it constantly), myopia gets worse quite quickly ? "It's genetics, wearing or not wearing glasses doesn't make any difference", they reply. This attitude it's precisely the responsible for the quick worsening of myopia in billions of young people since glasses become widely used .
Genetics has very little to do with common myopia. The real cause of it is over-accommodation and it must be avoided at all costs. That's why glasses must be used only when necessary: they force the eye to over-accommodate, while a myope without glasses has little or no need to accomodate when looking at close objects. The same principle applies to individuals with high myopia. They have to use glasses even when looking very close, BUT they must not wear the usual glasses,they must use undercorrections, i.e. weaker glasses that reduce the need for accommodation.
Fortunately something is changing, although slowly.
Many recent studies shed new light on myopia and its causes. Hung,Ciuffreda, Flitcroft, just to mention a few, published their work in recent years but everything was already clear 40 years ago when F.A Young and others published the study "The Transmission of Refractive Errors within Eskimo Families" (American Journal of Optometry and Archives of the American Academy of Optometry 46, no. 9, September, 1969).
The truth is quite simple: myopia is caused by over-accommodation. Myopia is an adaptative response to over-accomodation. The more myopic the eyes are, the less they have to accommodate.The use of glasses for short distance (and in general when they are not really necessary) forces the eyes to over-accommodate again, because glasses bring the focus of the images closer to the retina. As long as a body is growing, the eyes will respond to the over-accommodation with myopia, i.e.an abnormal growth of the eyeball. Fortunately, when body growths stops completely, glasses cannot damage our eyesight anymore, but by then the poor kid who started with -0.50 glasses will have a much, much stronger prescription that will make him totally dependent on glasses/contacts.
Did you know that successful experiments were carried about the use of positive lenses in young myopes ? Positive lenses are the exact opposite of glasses for myopia. Normally they are not useful to myopes because they need negative lenses to see distant thing well.
Even a myope has to accommodate a lot when he spends all his days at school, reading/studying, using the computer, and so on. Positive lenses (used for near work only) were proved to be highly effective in slowing down the progression of myopia.
I'm aware of at least one Asian country which recently decided to promote the use of positive lenses or bifocals/varifocals in young students.
When 70% or even 80 % of the young people in a country is myopic, you can't say it's genetics, especially if only a generation or two before only a tiny part of the young was myopic.