Place the lens on your fingertip and look at the shape from the side – if the seems to lip outwards at the edge, like a saucer, it is inside out it should cup upwards at the edge like a bowl. This may be difficult to see if the lenses are very thin.
Hold the lens between thumb and index finger and gentle push the lens edges towards each other. If the lens curls inwards, it is the right way round.
Insert the lens to your eye – if vision is clear and comfortable, it is the right way round.