untrained eye; layperson's perspective
Refers to the viewpoint or judgment of someone without specialized knowledge or experience. Often used in phrases like 素人目には (to the untrained eye).
To the untrained eye, it's impossible to tell the real from the fake.
Even a layperson can see that his skill is outstanding.
Compound of 素人 (amateur, layperson) and 目 (eye). The reading しろうとめ is a straightforward combination of the two words.