This document discusses key aspects of vision including the spacing of cones in the fovea, how to measure visual acuity, color vision, and the visual field. It notes that the spacing of cones at the fovea is approximately 2.5 μm and provides a YouTube video on measuring visual acuity. Color vision and the visual field are also mentioned as topics covered. The document concludes by thanking the reader.

1. Practical
Section 1

2. • Cone spacing at the fovea is approximately 2.5 μm

15. How to use it:
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19. Color Vision

33. Visual Field

41. Thank you