What is a common adverse effect expected after administering atropine eye drops?

Atropine eye drops are anticholinergic agents that work by dilating the pupil (mydriasis) and paralyzing the ciliary muscle (cycloplegia), which impacts the eye's ability to focus on near objects. One of the common adverse effects of these drops is blurred vision. This occurs because the paralysis of the ciliary muscle prevents the eye from accommodating, leading to difficulty focusing on close objects and causing a general sense of visual blur. The effect can last for several hours to days depending on the concentration of the atropine used.

The other potential effects, such as difficulty seeing in the dark, can occur due to dilated pupils allowing more light in, but they are not as directly related to the immediate adverse effects of atropine compared to blurred vision. Additionally, pinpoint pupils would suggest excessive cholinergic activity, which is the opposite effect of what atropine would induce. Excessive tearing is not a typical response to atropine; instead, the drug may actually decrease tear production due to its anticholinergic properties. Thus, blurred vision stands out as the most characteristic and expected adverse effect after the administration of atropine eye drops.