i have low myopia. and night/twilight myopia. and astigmatism. (OS and OD -1.00-0.50 x 180)myopia simply means i am nearsighted.
near objects are clear while the distant objects are blurry.
twilight myopia makes it more difficult to see in low illumination.
astigmatism adds on to the blurriness.
it causes difficulty to see fine details.
http://en.wikipedia.org/wiki/Myopia
http://en.wikipedia.org/wiki/Astigmatism_(eye)