The topside value represents the
spherical equivalent.
It is the estimation of the necessary
additional power (ADD) to restore
best vision (spherical equivalent =
sphere + ½ cylinder) at 66cm.
Measurement range of additional
power (ADD) is within the value range
0 D – 3.25 D.
Out of this range the output is n.a., with
the indication of Myopia or Hyperopia;
Output
The 2WIN assesses reading ability of a patient to 66 cm.
At the end of measurement, the 2WIN provides a power estimation of the positive lens for
the best vision to the VDT video display terminal in the conditions in which the examination
is taken.
2WIN returns 0 if the patient does not need any additional power to focus at VDU.
On the contrary, if the patient needs an additional power, 2WIN returns a positive value:
- If the measurement is taken wearing distance glasses the ADD power must be added
to the patient’s glasses power;
- If the measurement is taken without glasses the ADD value is the power of the
reading glasses to be prescribed.
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