Depth Perception

3-D Stereopsis

Painting Turns to Sculpture

Depth perception is a result of the two eyes working together with frontal placement on the head allowing stereopsis or the 3-D perception.

Stereopsis is achieved when the brain combines slightly different images, each one received by the different eye, into a meaningful synthesis of both the views in one single whole.

This meaningful synthesis in itself is what we call the depth perception!

It bestows on us a strong sense of 3-dimensionality and equips us with the judgment of relative distances between different objects around.

In other words, it turns the painting of the world around as seen by one single eye into a vast sculpture - that the world actually is - as seen by the combination of the two eyes placed frontally on our heads.

Stereopsis is stronger and more important at nearer distances giving us a more acute sense of depth perception there.

It's at nearer distances only that we need using accurate hand-eye coordination depending on the relative distances of the things around, in order to work with them.

Human civilization has developed more by working at nearer distances than at farther ones.

Hence the importance of 2-eyed depth perception!

Most of the human activities are near distance based, like working with machines, hitting a ball, shaking hands, inserting the key in the lock, typing on the keyboard, or any other thing that the modern life demands from us requiring a strong sense of depth perception.

People with only monocular or one-eye depth perception skills can do fine in many situations. There are also quite a few one-eyed (monocular) depth perception cues allowing us to make reasonably accurate depth judgments:

• Pictorial Cues: 3-D depth perception as depicted in 2-D as size reducing with distance.

• Overlay (Interposition): An object blocking part of another object from view is nearer than the object blocked.

• Shadows: They tell us about three dimensional form of objects as well as on the position of a source of light.

• Relative Size: Objects of the same size at different distances cast different retinal image sizes.

• Linear Perspective: Lines representing physically parallel structures seem to converge in the distance toward visual infinity.

• Texture Gradient: A regular structure, e.g., a tiled floor, appears to show smaller structures with increasing distance.

• Brightness: The brighter of two otherwise identical objects is perceived to be nearer.

• Aerial Perspective: As light is reduced and refracted by the atmosphere with distance, the farther objects appear darker and relatively blurred.

But people with monocular depth perception are not allowed entry in many professions requiring eye-hand coordination.

Stereopsis is part and parcel of the human evolution and potential; and as such, does enhance the quality of life.

There must be no compromise when it comes to developing this faculty against debilitating conditions like strabismus and amblyopia.

Vision therapy takes an effective care of the same through opening the third eye instantaneously, so that the visual system works perfectly with the skills it has been designed for, by the nature supreme!

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