To know if a contact lens is inside out, use these common methods:
- Place the lens on your fingertip with edges pointing up and look at it from the side. If it forms a perfect cup shape with edges upright, it is correct. If the edges flare outward like a rimmed soup bowl or have a noticeable lip, it is inside out.
- Use the "taco test" by pinching the lens gently in half between thumb and forefinger. If the edges curve inward like a taco shell, it is correct. If the edges flare outward like a bowl or soup spoon, it is inside out.
- Check for laser markings or numbers on the lens edge (if your lenses have them). Numbers should be viewed in normal order; if backward, the lens is inside out.
- Observe the tint on the lens edge (if applicable). A clear, distinct tint means the lens is correct; a washed-out tint means inside out.
- If the lens feels uncomfortable, moves excessively, causes a gritty feeling, or pops out easily when worn, it may be inside out.
These techniques will help identify the correct orientation of contacts before wearing them and avoid discomfort or vision issues.