Optical measuring device for measuring distances and/or thicknesses of a measuring object, comprising a first light source which emits polychromatic measuring light, a first optical waveguide (26, 51) through which measuring light passes and the end of which forms a first confocal aperture (29, 53), an imaging optical system which is suitable for causing a chromatic focus shift of the measuring light and for imaging the first confocal aperture (29, 53) in a measuring range, wherein different wavelengths are focused at different heights, and wherein measuring light reflected by the measuring object is again imaged back onto the first confocal aperture or onto a third confocal aperture, a receiving and evaluating unit which is designed to measure the intensity of the measuring light reflected by the measuring object and back through the first confocal aperture or a third confocal aperture as a function of the wavelength and to determine distances and/or thicknesses therefrom, characterised in that the measuring device comprises a second optical waveguide (28, 52) which is guided in parallel with the first optical waveguide (26, 51) and whose end forms a second confocal aperture (30, 54), the diameter of the second confocal aperture (30, 54) being greater than the diameter of the first confocal aperture (29, 53), and in that the receiving and evaluating unit is designed to also measure the intensity of the measuring light reflected by the measuring object and passed back through the second confocal aperture (30, 54) or a fourth confocal aperture as a function of the wavelength and to determine distances and/or thicknesses therefrom. a first light source which emits polychromatic measuring light, a first optical waveguide (26, 51) through which measuring light passes and the end of which forms a first confocal aperture (29, 53), an imaging optical system which is suitable for causing a chromatic focus shift of the measuring light and for imaging the first confocal aperture (29, 53) in a measuring range, wherein different wavelengths are focused at different heights, and wherein measuring light reflected by the measuring object is again imaged back onto the first confocal aperture or onto a third confocal aperture, a receiving and evaluating unit which is designed to measure the intensity of the measuring light reflected by the measuring object and back through the first confocal aperture or a third confocal aperture as a function of the wavelength and to determine distances and/or thicknesses therefrom, characterised in that the measuring device comprises a second optical waveguide (28, 52) which is guided in parallel with the first optical waveguide (26, 51) and whose end forms a second confocal aperture (30, 54), the diameter of the second confocal aperture (30, 54) being greater than the diameter of the first confocal aperture (29, 53), and in that the receiving and evaluating unit is designed to also measure the intensity of the measuring light reflected by the measuring object and passed back through the second confocal aperture (30, 54) or a fourth confocal aperture as a function of the wavelength and to determine distances and/or thicknesses therefrom.