Echolocation

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Echolocation, also called biosonar, is the biological sonar used by several animals such as shrews, most bats, and most cetaceans. The term was coined by Donald Griffin, who was the first to conclusively demonstrate its existence in bats. Two bird groups also employ this system for navigating through caves, the so called cave swiftlets in the genus Aerodramus (formerly Collocalia) and the unrelated Oilbird Steatornis caripensis.

Echolocating animals emit calls out to the environment and listen to the echoes of those calls that return from various objects in the environment. They use these echoes to locate, range, and identify the objects. Echolocation is used for navigation and for foraging (or hunting) in various environments.

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[ashokrajur09]

so it is not that, only with light we can see objects... but also with the sound we can make mental picture of the surroundings... it would be great if scientists can come up with a sound solution for the visually challenged..