Multi-focal lens
An imaging lens structure and method of imaging are presented. The imaging lens structure comprising a lens region defining an effective aperture of the lens structure. The lens region comprises an arrangement of lens zones distributed within the lens region and comprising zones of at least two different optical functions differently affecting light passing therethrough. The zones of at least two different optical functions are arranged in an interlaced fashion along said lens region corresponding to a surface relief of the lens region such that adjacent lens zones of different optical functions are spaced apart from one another along an optical axis of the lens structure a distance larger than a coherence length of light at least one spectral range for which said lens structure is designed.
1. An imaging lens structure comprising:
a multi-focal lens region comprising first lens segments and second lens segments, the first lens segments and the second lens segments providing different focal lengths,
said lens segments being disposed in a disordered arrangement at a surface of said multi-focal lens region,
the first lens segments being arranged in an annular arrangement disrupted by the second lens segments to provide the disordered arrangement.
2. The imaging lens structure of claim 1 , the disordered arrangement comprising a surface relief structure.
3. The imaging lens structure of claim 1 , wherein the first segments and second segments being spaced apart from one another along an optical axis of the lens structure a distance larger than a coherence length of light of white light illumination.
4. The imaging lens structure of claim 1 , wherein the imaging lens structure is configured as an ophthalmic lens.
5. The imaging lens structure of claim 4 , wherein the imaging lens structure is configured as an intraocular lens.
6. An imaging method comprising:
passing light through the multi-focal lens of claim 1 ;
imaging light passing through the first lens segments according to a first focal length thereof; and
imaging light passing through the second lens segments according to a second focal length thereof.
7. The imaging lens structure of claim 4 , wherein the imaging lens structure is configured as an intracorneal lens.
8. The imaging lens structure of claim 4 , wherein the imaging lens structure is configured as a contact lens.
9. The imaging lens structure of claim 4 , wherein the multi-focal lens region is a bi-focal lens region.
10. The imaging lens structure of claim 4 , wherein transmitted energy is evenly divided between two optical powers of the imaging lens structure.
11. The imaging lens structure of claim 1 , wherein light passing through regions of different focal lengths of the multi-focal lens region is not phase correlated.
12. The imaging lens structure of claim 4 , wherein light passing through regions of different focal lengths of the multi-focal lens region is not phase correlated.
13. The imaging lens structure of claim 1 , the imaging lens structure being non-diffractive.
14. The imaging lens structure of claim 4 , the imaging lens structure being non-diffractive.
15. The imaging lens structure of claim 1 , the first lens segments having a same shape.
16. The imaging lens structure of claim 4 , the first lens segments having a same shape.
17. The imaging lens structure of claim 1 , the first lens segments comprising segments of different shapes.
18. The imaging lens structure of claim 4 , the first lens segments comprising segments of different shapes.
19. The imaging lens structure of claim 1 , the first lens segments comprising segments of different dimensions.
20. The imaging lens structure of claim 4 , the first lens segments comprising segments of different dimensions.