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• Transmissiveness (amount of light passing through retina) decreases.
• Three times as much illumination is required by the older eye. At age 60 people need three times more light than at age 20.
• Sensitivity to glare increases.
• Visual accommodation to near objects decreases. This is called presbyopia. This is due to loss of elasticity in the lens. Time to switch from near to distant objects (and vice versa) increases.
• Even with corrections, 75-85 year olds have less visual acuity for distant objects.
• Lens turns yellow, making it more difficult to discriminate among colors at the low end of the color spectrum (e.g., blue and green).
• Time to adapt from dark to light environments and vice versa increases.
• Ability to detect information in the periphery of the visual field decreases.
• Night vision decreases.
• Depth perception decreases.