| He had minimal refractive error of 0.5 dioptre spherical equivalent hyperopia in each eye. |
| The pitch trim control linkage located in the cockpit was removed and visually examined using a dioptre lens magnifier. |
| A dioptre is 1 divided by the focal length of the lens in centimetres. |
| A one eye-piece dioptre adjustment allows the binoculars to be set to suit your own eyesight and folddown rubber eye-cups allow use by spectacle wearers. |
| The 2.5 dioptre lens provides optimal magnification, field of view and working distance with long-life, ultra-bright, reflected fluorescent illumination providing superb image clarity and colour rendition. |
| For easier handling the dioptre compensation was equipped with a resolution while the argon filling makes the internal optics fog proof. |
