A system (200, 300, 400, 500, 600, 700, 800, 900) for performing ophthalmic optical coherence tomography, the system comprising: a light source (202, 302, 402, 502, 602, 702, 802, 902), an output lens (298, 398, 498, 598, 698, 798, 898, 998), and a set of optical components (210, 310, 410, 510, 610, 710, 810, 910) between the light source and the output lens, the set of optical components comprising an afocal zoom telescope (216, 316, 416, 516, 616, 716, 816, 916), wherein the set of optical components is adapted to provide imaging both at a first field of view with a first resolution and at a second field of view with a second resolution, wherein the set of optical components has a first configuration providing the first field of view with the first resolution and a second configuration providing the second field of view with the second resolution, wherein the first field of view is wider than the second field of view and the second resolution is higher than the first resolution, and wherein the set of optical components is adapted to provide imaging at the first field of view by passing light emitted from the light source through the afocal zoom telescope, characterized in that the afocal zoom telescope is movable between a first position and a second position, wherein when the afocal zoom telescope is in its first position the set of optical components is in its first configuration such that light emitted from the light source passes through the afocal zoom telescope, and wherein when the afocal zoom telescope is in its second position the set of optical components is in its second configuration such that light emitted from the light source does not pass through the afocal zoom telescope, or in that when the set of optical components is in its first configuration, the system is configured such that light emitted from the light source travels along a first optical path (370, 470, 570, 670, 770, 870, 970), wherein the first optical path passes through the afocal zoom telescope (316, 416, 516, 616, 716, 816, 916), and wherein when the set of optical components is in its second configuration, the system is configured such that light emitted from the light source travels along a second optical path (380, 480, 580, 680, 780, 880, 980), wherein the second optical path does not pass through the afocal zoom telescope. a light source (202, 302, 402, 502, 602, 702, 802, 902), an output lens (298, 398, 498, 598, 698, 798, 898, 998), and a set of optical components (210, 310, 410, 510, 610, 710, 810, 910) between the light source and the output lens, the set of optical components comprising an afocal zoom telescope (216, 316, 416, 516, 616, 716, 816, 916), wherein the set of optical components is adapted to provide imaging both at a first field of view with a first resolution and at a second field of view with a second resolution, wherein the set of optical components has a first configuration providing the first field of view with the first resolution and a second configuration providing the second field of view with the second resolution, wherein the first field of view is wider than the second field of view and the second resolution is higher than the first resolution, and wherein the set of optical components is adapted to provide imaging at the first field of view by passing light emitted from the light source through the afocal zoom telescope, characterized in that the afocal zoom telescope is movable between a first position and a second position, wherein when the afocal zoom telescope is in its first position the set of optical components is in its first configuration such that light emitted from the light source passes through the afocal zoom telescope, and wherein when the afocal zoom telescope is in its second position the set of optical components is in its second configuration such that light emitted from the light source does not pass through the afocal zoom telescope, or in that when the set of optical components is in its first configuration, the system is configured such that light emitted from the light source travels along a first optical path (370, 470, 570, 670, 770, 870, 970), wherein the first optical path passes through the afocal zoom telescope (316, 416, 516, 616, 716, 816, 916), and wherein when the set of optical components is in its second configuration, the system is configured such that light emitted from the light source travels along a second optical path (380, 480, 580, 680, 780, 880, 980), wherein the second optical path does not pass through the afocal zoom telescope.