Snails do have eyes which are located on the snails eye stalks.
The snails eyes that are located on the snails eye stalks allow the snails to detect changes in light, movement and shapes.
Although snails have eyes, a snails vision is usually poor and snails also lack the ability to focus images like humans can.
And unlike human eyes, snail eyes can't use ciliary muscles for automatic focusing and instead snails rely on their flexible stalks to manually adjust their vision.
Most land snails have 2 pairs of tentacles on their heads, with the upper pair of tentacles holding the snails eyes.
The snails eyes can detect dark and light as well as shapes and movement.
A snails vision is usually poor and also blurry and snails cannot see in color.
And because snails lack ciliary muscles, snails will use their eye stalks to move and manually focus their eyes, which helps the snails to "periscope" their surroundings.
Snails also have the ability to retract their eye stalks to protect their eyes from hazards or predators.
And some species of snails, most particularly the carnivorous snails have more complex eyes than other snails.
And in some cases, snails can also regrow their eyes if the snails eyes are injured or lost.