Lens Near
A look at what is currently available on eBay
 Konica 135 2.5 Lens- near perfect with case US $80.00 
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 CANON 50 mm F/1.8 PRIME LENS METAL MOUNT-NEAR MINT US $99.00
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 1969 NEAR MINT LEN WILKINS TOPPS CARD # 44 PSA-7 HOF US $24.99
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what power lens is needed for a person whose near point is 75 cm?
The answer to this problem is +2.7 D. But... I can't seem to get to that answer. Will someone please help me?
This eye needs to be able to have an object placed at 25 cm (proper near point) and make it appear to be 75 cm away (a 'virtual' image)
Lens formula
1/f = 1/Do + 1/Di = 1/25 - 1/75 = 2/75
1/f = D (power in dioptres, if 'f' is in metres)
Hence D = 2/75 x 100 = +2.7
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