2 Eyes + Brain = Vision

The perception of two eyes merged in the brain as a single image.

Good vision – without strain – means

• Acuity
• Focusing
• Parallel eyes
• Binocular vision
• Depth perception
• Peripheral vision
• Color vision
• Stereoscopic vision

Poor vision leads to

• Blurring
• Double vision
• Squeezing
• Squinting
• Eye-strain
• Lazy eye
• Fatigue
• Headaches
• Slow reading
• Slow reaction
• Nervous strain