Is there a rough visual acuity test that i can easily perform?

Yes: There are a number of on-line tests of near and distance acuity. For example, www.Preventblindness.Org/eye_tests/ is a good resource. There are also vision test apps for iphone and other mobile devices.

Simple visual acuity: Cover one eye and see how well you read a distant sign with small print. Then cover the other eye and compare what you see. You can do the same at close with stock market print in the news paper.

On line: You can "Google" Snellen acuity chart to get a rough idea of the vision. You can also compare the limits of your vision with someones vision who has known acuity. At your age, i assume that you have a driver's license and most likely have had to pass an acuity test to get that license approved.