Ophthalmic surgical microscope having an OCT-system
An ophthalmic surgical microscope ( 100 ) has a microscope main objective ( 101 ) and a viewing beam path ( 105 ) which passes through the microscope main objective ( 101 ) for visualizing an object region. The ophthalmic surgical microscope ( 100 ) includes an OCT-system ( 140 ) for recording images of the object region ( 108 ). The OCT-system ( 140 ) includes an OCT-scanning beam ( 142 ) which is guided via a scan mirror arrangement ( 146 ) to the object region ( 108 ). An optic element ( 147 ) is provided between the scan mirror arrangement ( 146 ) and the microscope main objective ( 101 ). This optic element ( 147 ) bundles the OCT-scanning radiation exiting from the scan mirror arrangement ( 146 ) and transfers the same into a beam path which passes through the microscope main objective ( 101 ). Alternatively or in addition, the ophthalmic surgical microscope ( 100 ) includes an ophthalmoscopic magnifier lens ( 132 ) which can be pivoted into and out of the viewing beam path ( 105 ) and the OCT-scanning beam ( 142 ).
1. An ophthalmic surgical microscope defining a viewing beam path and comprising:
a microscope main objective defining a focal plane of said ophthalmic surgical microscope and being mounted so as to permit said viewing beam path to pass therethrough permitting examination of a region of an object;
an OCT-system for recording images of said object region;
said OCT-system defining an OCT-scanning plane and providing an OCT-scanning beam and including a scanning mirror device for scanning said OCT-scanning beam;
an optical unit mounted between said scanning mirror device and said microscope main objective for bundling the OCT-scanning beam exiting from said scanning mirror device and guiding the bundled OCT-scanning beam into a beam path passing through said microscope main objective to said object region; and,
said optical unit including a movable lens assembly for shifting said OCT-scanning plane relative to said focal plane so as to provide an offset therebetween wherein an intensity distribution of the OCT-scanning beam has a smallest constriction.
2. The ophthalmic surgical microscope of claim 1 , further comprising a lens changing unit and said optical unit being mounted in said lens changing unit.
3. The ophthalmic surgical microscope of claim 1 , wherein said optical unit is a zoom assembly having a variable focal length.
4. The ophthalmic surgical microscope of claim 1 , said surgical microscope further comprising a focal length changing unit for changing the focal length of said microscope main objective.
5. The ophthalmic surgical microscope of claim 1 , wherein said scanning mirror device includes a first scanning mirror; and, a first device for rotating said first scanning mirror about a first rotational axis.
6. The ophthalmic surgical microscope of claim 4 , wherein said scanning mirror device comprises a second scanning mirror; and, a second device for rotating said second mirror about a second rotational axis laterally offset at right angles to said first rotational axis.
7. The ophthalmic surgical microscope of claim 1 , wherein said OCT-system further comprises a light conductor having an end portion having a light exit end face for said OCT-scanning beam; and, means for moving said end portion.
8. The ophthalmic surgical microscope of claim 1 , further comprising a reduction lens being movably mounted; said reduction lens being movable into a first position whereat said viewing beam path and said OCT-scanning beam path pass through said reduction lens and into a second position whereat said viewing beam path and said OCT-scanning beam path do not pass through said reduction lens.
9. The ophthalmic surgical microscope of claim 1 , further comprising an ancillary module being movably mounted; said ancillary module having an optical assembly including at least one of an ophthalmoscopic magnifier lens and a reduction lens; and, said ancillary module being movable between a first position whereat said viewing beam path and said OCT-scanning beam path pass through said optical assembly and a second position whereat said viewing beam path and said OCT-scanning beam path do not pass through said optical assembly.
10. The ophthalmic surgical microscope of claim 1 , wherein said OCT-system comprises generating means for supplying said OCT-scanning beam at a first wavelength and at a second wavelength different from said first wavelength.
11. The ophthalmic surgical microscope of claim 1 , wherein said OCT-system is a first OCT-system providing a first OCT-scanning beam and said surgical microscope further comprises a second OCT-system providing a second OCT-scanning beam; and, said first OCT-scanning beam has a first wavelength and said second OCT-scanning beam has a second wavelength different from said first wavelength.
12. The ophthalmic surgical microscope of claim 1 , wherein said offset is not greater than a confocal parameter (z) of the OCT-scanning beam in the region of the OCT-scanning plane.