Estimate the diameter of your eyeball. d=5.0mm=5.0mm d=1.0cm=1.0cm d=2.5cm=2.5cm d=10cm     Bring page up to the closest distance at which the text is sharp-not the closest at which you can still read it, but the closest at which the letters remain sharp. If you wear glasses or contact lenses, leave them on. This distance is called the near point of your (possibly corrected) eye. Estimate it. s=3cm=3cm s=30cm=30cm s=60cm=60cm s=100cm=100cm   Estimate the effective focal length of your eye. The effective focal length includes the focusing due to the lens, the curvature of the cornea, and any corrections you wear. Ignore the effects of the fluid in your eye. f=1.3cm=1.3cm f=2.3cm=2.3cm f=7.2cm=7.2cm f=10cm

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Estimate the diameter of your eyeball.
d=5.0mm=5.0mm
d=1.0cm=1.0cm
d=2.5cm=2.5cm
d=10cm

 

 
Bring page up to the closest distance at which the text is sharp-not the closest at which you can still read it, but the closest at which the letters remain sharp. If you wear glasses or contact lenses, leave them on. This distance is called the near point of your (possibly corrected) eye. Estimate it.
s=3cm=3cm
s=30cm=30cm
s=60cm=60cm
s=100cm=100cm
 
Estimate the effective focal length of your eye. The effective focal length includes the focusing due to the lens, the curvature of the cornea, and any corrections you wear. Ignore the effects of the fluid in your eye.
f=1.3cm=1.3cm
f=2.3cm=2.3cm
f=7.2cm=7.2cm
f=10cm
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