Optometry drops do not hurt the eyes, optometry commonly used eye drops is tropicamide eye drops, optometry before the use of tropicamide is to paralyze the ciliary muscle, release spasm, remove the adjusting force, so that the test out of the degree more accurate. The action time of tropinamide is 4-6 hours, in this time period there will be blurred vision, especially blurred near, so do not read, write homework, look at the cell phone within 4-6 hours of the action of the dilated pupil medicine. In addition, after dilating the pupil will be afraid of light, go out in the sunlight need to wear a sunglasses, 4-6 hours after the pupil natural recovery, blurred vision, fear of light symptoms also disappeared.