Place the lens on your fingertip and look at the shape from the side
If the edges flare outward like a bowl with a wide rim, it is likely inside out
If the edges point straight up and form a neat cup shape, it is likely correct
Hold the lens up to the light and check the rim
If the rim looks uneven or outward-facing, it is likely inside out
If the lens feels uncomfortable or blurry after insertion, it may be inside out
Check for any markings or indicators on the lens if provided by the manufacturer
Gently pinch the lens edges together
If the edges come together easily and smoothly, it is likely correct
If the edges resist and flare outward, it is likely inside out