No, fleas are not blind. They have two simple eyes and are evolutionarily related to the mecoptera, which is an order of insects that has very good eyesight.
Although fleas can see quite well, they do have numerous other sensory mechanisms other than eyesight which they have adapted to help them locate suitable hosts.
For example, they have the ability to detect increased levels of carbon dioxide in the air which is a method that they use to determine the presence of a host.
Fleas also have tiny hairs and antenna on their body which can be used to detect vibrations and air movements which signal the presence of a potential host.
The flea larva that emerge from flea eggs, are blind, however. They must rely on the secondary sensory abilities in order to locate food source.
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