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English: Gray, blue, red, green, light green, black graph papers with 1 cm–0.5 cm–1 mm grids (page size: A4) in printable PDF format. Date 25 July 2013, 18:04:17
There are many ways to measure PD ranging from a simple ruler (or "PD stick") traditionally used by eye care professionals (ECP) to the so-called pupillometers to state of the art digital systems that may offer better accuracy and precision while also allowing for various other measurements (e.g., vertex distance, pantoscopic tilt, wrap, etc ...
Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. [2] Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance. [3]
Original file (2,689 × 2,308 pixels, file size: 167 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Quad paper, sometimes referred to as quadrille paper from French quadrillé, 'large square', [5] is a common form of graph paper with a sparse grid printed in light blue or gray and right to the edge of the paper.
Original file (7,381 × 22,439 pixels, file size: 1.71 MB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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