Situation during Refraction
The patient has sharp vision at the required reading distance when looking through the trial lens (here + 5.00 D); image O’ is generated on the retina
Two Situations with Spectacle Lenses without Taking the Wearing Power into account
Without the correction value, the patient’s vision is unsharp when looking through the lens (here + 5.00 D) at the required reading distance; image O’ is generated behind the retina
Without the correction value, the wearer has to increase the reading distance to see sharply (power here + 5.00 D); image O’ is located on the retina
Needless to say, neither of these possibilities is the aim of the refraction procedure. The wearer's dioptric power must therefore be corrected. |  Carl Zeiss near You
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