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Click View > Settings > View.
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Click the Advanced tab.
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Type a value for Eye separation.
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Type a value for Focal length.
The Eye separation is the actual distance between your eyes in model units. Typically, this value is about 2.2 inches or 5.6 centimeters. You must convert your actual distance values for the model. A larger value exaggerates the effect, while a smaller value reduces the effect. An accurate value produces realistic depth perception.