Nice and easy. Step 1 – Hold the pupillary distance ruler up to the bridge of your nose. Your pupillary distance ruler can be any millimetre ruler. Step 2 – Face a mirror. Step 3 – Close your right eye. Whilst looking in the mirror, Ensure the pupillary distance ruler’s zero is aligned with your left pupil. Step 4 – Keep the pupillary.
The pupil distance is defined as the distance between the edge of the tube lens housing above the engraving and the entrance pupil of the objective. These lenses are engraved with an arrow next to an infinity symbol (∞) to indicate which side of the lens should face the objective (infinity space), as shown in the diagram above.
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Alternatively, if the sensor has already been chosen, the focal length can be determined directly from the FOV and WD by substituting Equation 1 in Equation 2, as shown in Equation 3. (3)f = (H×WD) FOV f = ( H × WD) FOV. As previously stated, some amount of flexibility to the system's WD should be factored in, as the above examples are only. Your inter-pupillary distance (PD) is the distance between your pupils, measured in millimeters. Eye doctors always measure this distance to ensure an accurate fit when they write prescriptions for eyeglasses.
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An SPH number indicates if you are farsighted or nearsighted. If the SPH value is 0.00, or noted by Plano, Pl, or an infinity sign, you do not have a vision distance problem. Typical SPH numbers range between 0.00 and +/- 20.00. The SPH number on a glasses prescription is listed as a positive (+) or negative (-) number.