The clams does not proper eyes instead contains pinholes over the exposed mantles. They belong to Bivalvia class of mollusca
The eyes of clams are located over the circumference of the hemispherical shell. Light travels through the retina of a clam's eye, where it is poorly focussed by the cornea, before being reflected from a hemispherical concave mirror along the back of the eye.Clam eyes can detect fluctuations in light levels because they are light-sensitive. They shrink their syphon and mantle and partially seal their shells in response to abrupt light dimming, object movement, and sudden brilliant light. When individuals sweep their hands over the water, clams quickly close their shells and retract their mantles.
Hence, clams primitive eye detect changes in intensity of light .
To know more about Bivalvia.
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