Ophthalmoscopic attachment for a surgical microscope

Claim 2

An ophthalmoscopic attachment for a surgical microscope for viewing the fundus or other particular area of the vitreous body of the eye, said microscope having a main lens and at least one pair of stereoscopic optical viewing paths that are spacially separated behind said main lens, said attachment comprising: an optical axis extending from an eye-facing end to a lens end which faces the microscope; at least one ophthalmoscopic lens positioned in proximity to said eye-facing end for producing an inter-image of said area of the eye on an inter-image plane; optical system means for erecting said inter-image and for interchanging said optical viewing paths, said optical system means being located directly behind said inter-image plane where said stereoscopic optical viewing paths are still intertwined and are not yet spacially separated; and lens means, movable along said optical axis and positioned between said optical system means and said lens end, for adjusting the focus of said particular area of the eye being viewed.

Claim 3

The ophthalmoscopic attachment of claim 1 further comprising pivot means for connecting said attachment to said surgical microscope so that said attachment may be selectively positioned in front of said main lens.

Claim 4

The ophthalmoscopic attachment of claim 1 wherein said optical system means is a lens system in which a triplet is positioned between two field lenses, said triplet comprising one lens displaying negative refractive power interposed between two lenses displaying positive refractive power.

Claim 5

The ophthalmoscopic attachment of claim 3 wherein said optical system means produces an image of said inter-image produced by said ophthalmoscopic lens at an object-to-image ratio of 1:1.

Claim 6

The ophthalmoscopic attachment of claim 4 wherein: said main lens of the surgical microscope has a focal length of 200 mm; said two field lenses and triplet comprising said lens system are color-error-corrected; and in said triplet, the focal lengths f 1 and f 3 of said two lenses displaying positive refractive power and the focal length f 2 of said one lens displaying negative refractive power have focal length ratios within the following ranges: f.sub.3 :f.sub.1 =[0.9 . . . 2.0] -f.sub.2 :f.sub.1 =[0.4 . . . 0.6].

Claim 7

The ophthalmoscopic attachment of claim 5 further comprising a predetermined lens system design wherein f 3 :f 1 =2.0 and -f 2 :f 1 =0.545, and wherein the characteristics of the lens elements and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table, the radii of the respective surfaces being designated by r with a numerical subscript identifying the particular surface numbered consecutively from said lens end, the thickness and spacings being designated by d with a numerical subscript numbered in a single series from said lens end, and the respective indices of refraction n and the Abbe numbers νe of the elements being given in the indicated columns: __________________________________________________________________________ Radius Thickness Distance Refractive Abbe Lens r.sub.i /mm d.sub.i /mm d.sub.i /mm Index n(546 nm) Number ν.sub.e __________________________________________________________________________ r.sub.1 = 4.9911 d.sub.1 = 3.000 1.68637 44.2 A2 r.sub.2 = -18.9821 d.sub.2 = 1.000 1.81265 25.2 r.sub.3 = -59.2871 d.sub.3 = 30.750 r.sub.4 = 6.4576 L1 d.sub.4 = 2.500 1.80730 46.1 r.sub.5 = -140.0550 d.sub.5 = 1.948 r.sub.6 = -8.7323 L2 d.sub.6 = 0.600 1.81265 25.2 r.sub.7 = 5.7935 d.sub.7 = 6.175 r.sub.8 = 925.3580 L3 d.sub.8 = 2.500 1.80730 46.1 r.sub.9 = -12.3903 d.sub.9 = 27.530 r.sub.10 = 86.8200 d.sub.10 = 1.000 1.81265 25.2 A1 r.sub.11 = 17.1400 d.sub.11 = 3.000 1.68637 44.2 r.sub.12 = -31.4353 __________________________________________________________________________

Claim 8

The ophthalmoscopic attachment of claim 5 further comprising a predetermined lens system design wherein f 3 :f 1 =1.66 and -f 2 :f 1 =0.56, and wherein the characteristics of the lens elements and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table, the radii of the respective surfaces being designated by r with a numerical subscript identifying the particular surface numbered consecutively from said lens end, the thickness and spacings being designated by d with a numerical subscript numbered in a single series from said lens end, and the respective indices of refraction n and the Abbe numbers νe of the elements being given in the indicated columns: __________________________________________________________________________ Radius Thickness Distance Refractive Abbe Lens r.sub.i /mm d.sub.i /mm d.sub.i /mm Index n(546 nm) Number ν.sub.e __________________________________________________________________________ r.sub.1 = 42.9911 d.sub.1 = 1.696 1.68637 44.2 A2 r.sub.2 = -18.9821 d.sub.2 = 0.848 1.81265 25.2 r.sub.3 = -59.2871 d.sub.3 = 32.070 r.sub.4 = 7.9988 L1 d.sub.4 = 2.500 1.80730 46.1 r.sub.5 = -106.2270 d.sub.5 = 2.620 r.sub.6 = -9.5154 L2 d.sub.6 = 0.600 1.81265 25.2 r.sub.7 = 7.7269 d.sub.7 = 4.940 r.sub.8 = -148.7780 L3 d.sub.8 = 2.500 1.80730 46.1 r.sub.9 = -11.5635 d.sub.9 = 28.490 r.sub.10 = 86.8223 d.sub.10 = 0.848 1.81265 25.2 A1 r.sub.11 = 17.1339 d.sub.11 = 1.696 1.68637 44.2 r.sub.12 = -28.2267 __________________________________________________________________________

Claim 9

The ophthalmoscopic attachment of claim 5 further comprising a predetermined lens system design wherein f 3 :f 1 =0.88 and -f 2 :f 1 =0.40, and wherein the characteristics of the lens elements and their spatial relationship to each other are substantially in the proportions indicated by the data in the following table, the radii of the respective surfaces being designated by r with a numerical subscript identifying the particular surface numbered consecutively from said lens end, the thickness and spacings being designated by d with a numerical subscript numbered in a single series from said lens end, and the respective indices of refraction n and the Abbe numbers νe of the elements being given in the indicated columns: __________________________________________________________________________ Radius Thickness Distance Refractive Abbe Lens r.sub.i /mm d.sub.i /mm d.sub.i /mm Index n(546 nm) Number ν.sub.e __________________________________________________________________________ r.sub.1 = 30.5000 d.sub.1 = 3.000 1.68637 44.2 A2 r.sub.2 = -18.9820 d.sub.2 = 1.000 1.81265 25.2 r.sub.3 = -59.2870 d.sub.3 = 31.687 r.sub.4 = 5.9576 L1 d.sub.4 = 2.500 1.61521 58.4 r.sub.5 = 50.5546 d.sub.5 = 3.277 r.sub.6 = -6.0844 L2 d.sub.6 = 1.000 1.65222 33.6 r.sub.7 = 5.4845 d.sub.7 = 2.333 r.sub.8 = 17.7756 L3 d.sub.8 = 2.500 1.61521 58.4 r.sub.9 = -8.1069 d.sub.9 = 23.117 r.sub.10 = 86.8200 d.sub.10 = 1.000 1.81265 25.2 A1 r.sub.11 = 17.1400 d.sub.11 = 3.000 1.68637 44.2 r.sub.12 = -30.5299 __________________________________________________________________________

Claim 10

The ophthalmoscopic attachment of claim 1 wherein said optical system means is a reflection-path optical system comprising one of (a) a straight-view inversion prism system and (b) a mirror system exhibiting the same beam path.

Claim 11

The ophthalmoscopic attachment of claim 9 wherein said straight-view inversion prism system is a Schmidt-Pechan prism having a roof.

Claim 12

The ophthalmoscopic attachment of claim 1 wherein said surgical microscope has a second pair of stereoscopic optical viewing paths for observing said particular area of the eye being viewed.

Claim 13

An ophthalmoscopic attachment for a surgical microscope for viewing the fundus or other particular area of the vitreous body of the eye, said microscope having a main lens and at least one pair of spacially-separated stereoscopic optical viewing paths that are positioned behind said main lens, said attachment comprising: an optical axis extending from an eye-facing end to a lens end which faces the microscope; at least one ophthalmoscopic lens positioned in proximity to said eye-facing end for producing an inter-image of said area of the eye on a first inter-image plane; a lens system positioned directly behind said first inter-image plane, where said stereoscopic optical viewing paths are still intertwined and are not yet spacially separated, so that said lens system (a) erects said inter-image, (b) interchanges said optical viewing paths, and (c) projects said erected and unreversed image on a second image plane which is viewed through said microscope; and lens means, movable along said optical axis and positioned between said lens system and said lens end, for adjusting the focus of said particular area of the eye being viewed.

Claim 14

An ophthalmoscopic attachment for a surgical microscope for viewing the fundus or other particular area of the vitreous body of the eye, said microscope having a main lens and at least one pair of spacially-separated stereoscopic optical viewing paths that are positioned behind said main lens, said attachment comprising: an optical axis extending from an eye-facing end to a lens end which faces the microscope; at least one ophthalmoscopic lens positioned in proximity to said eye-facing end for producing an inter-image of said area of the eye on a first inter-image plane; a lens system positioned directly behind said first inter-image plane, where said stereoscopic optical viewing paths are still intertwined and are not yet spacially separated, so that said lens system (a) erects said inter-image, (b) interchanges said optical viewing paths, and (c) projects said erected and unreversed image on a second image plane which is viewed through said microscope; and lens means, movable along said optical axis and positioned between said lens system and said lens end, for adjusting the focus of said particular area of the eye being viewed.

Claim 15

The ophthalmoscopic attachment of claim 12 wherein said lens system comprises a triplet in which one lens displaying negative refractive power is interposed between two lenses displaying positive refractive power.