text: my eye sight is minutely weak.when i bring my finger close to eye n see far things just above it,i see things? my eye sight is minutely weak.when i bring my finger close to eye n see far things just above it,i see things clearly.why is it so?coz of diffraction or what?? most of eye weakness is the problem the ones' eyes' focal point. average human focal poit is 20, yours is probable less. basically the whole point of eye surgury is to correct your focal point of your eyes.