| 摘要 |
Binoculars wherein the focus is fixed are provided with means for compensating for a user's visual acuity if same deviates from a predetermined visual acuity value. The means comprises a mechanism, for adjusting the optical distance between objective lens and ocular lens (5) having a pin (7) attached to a slidable barrel (6) housing lens (5). A rotatable ring (10) has groove (11) engaging the pin (7) which passes through slot (9) in barrel housing (8). Rotation of ring (10) moves barrel (6) fore and aft to change the distance between objective and ocular lenses. The mechanism is normally covered by external barrel (13).
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