Design of off-axis two mirror ophthalmic lens for fundus camera
In order to eliminate the undesirable light such as scatter light and central ghost in a classical fundus camera, an off-axis two-mirror ophthalmic lens was designed, with large field of view and large working distance. An unobstructed, reflective ophthalmic lens was designed to avoid scatter light and central ghost in the refractive optical system. By using an off-axial, reflective, unobstructed optical system, a large field of view and a large working distance were achieved. The free form surfaces were introduced to correct the off0axial aberrations, which made the system suitable for both the imaging system and the illumination system. The final off0sxis ophthalmic lens consists of a primary mirror and a secondary mirror, with free working distance 50 mm and the f... |
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