| 摘要 |
FIELD: physics.SUBSTANCE: eye lens contains a main part of the lens, the recessed part the surface of which is recessed with reference to the surface of the main part of the lens, optical centre and optical axis passing through named optical centre. The main part of the lens has, at least, one boundary with the recessed part and has optical force within approximately -20 and +35 dioptres. The recessed part is located at a distance less than 2 mm from the optical centre and contains a part for near vision with the relative dioptre approximately from +1.0 up to +5.0 with reference to the optical force of the lens main part. The boundary or the boundaries of the recessed part with the main part of the lens form a part or parts of smooth transition with the shape allowing to refract light towards from the optical axis, and with the curvature resulting in losses of light within the circle with the diameter 4 mm around the optical centre less than approximately 15%. The losses of light are determined as a share of quantity of light in the focus from intra-ocular lens (IOL) in comparison with the quantity of light in the focus from identical IOL without the named recessed part.EFFECT: increase of contrast sensitivity of eye lenses.39 cl, 36 dwg, 8 tbl |
