Myopia Without The Minus Lens  --  Illustrated
Our eyes are designed for distant viewing.  They are at rest (i.e. completely relax) when looking at distant objects, as shown in Figure 1.  Light rays from distant objects are normally represented with parallel lines as shown in Figure 1 Large.
When an object is moved closer, light rays from that object will come to a focus behind the retina, resulting in a blurred image, as shown in Figure 2.  Fortunately, this only happens to old people who have presbyopia.
For most people(who don't have presbyopia), when looking at close objects, our eyes immediately and automatically tense up by tightening the ciliary muscle around the lens, thereby making the lens thicker in order to bend the light rays more so that they come to a focus on the retina as shown in Figure 3. 
When we do too much close work, the eyes get stuck in the tense position and the lens fails to return to its original shape.  The lens becomes thicker and the eye can no longer see distant objects clearly.  Light rays from distant objects come to a focus in front of the retina resulting in a blurred image as shown in Figure 4.  The eyes can no longer see 6 meters (20 feet) or more clearly.  They can only see clearly up to 2 meters (6.6 feet) as shown in Figure 5.  Anything beyond is very slightly blurry.
We continue to do lots of close work (Figure 3)

After a while, the lens becomes thicker again and distant objects become more blurry (Figure 6) than before.  Now the eyes can see clearly up to 1 meter (3.3 feet) only, as shown in Figure 7.  Anything beyond is now more blurry than before.
Since no glasses are available, we have to live with slightly blurred distant vision for the rest of our lives.
During summer break or vacation, our eyes will actually improve as we don't do a lot of close work.
When summer break or vacation time is over, our eyes will get worse again as we do lots of close work.
Without the use of the minus lens, myopia seldom progresses beyond -3.00D.  It will normally stay below -2.00D which most people can live with.  This is indeed what happens to indigenous or primitive people and people in underdeveloped countries today.  This is also what happens to people who refuse to wear the destructive prescription glasses (minus lens) in developed countries.

Fortunately and thankfully, most people can tolerate this kind of slightly blurred distant vision.
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