Example image of eyePlorer eyePlorer map for 'Focus (optics)': Geometrical optics Ray (optics) Optical aberration Airy disk Aperture Diffraction Collimated light Lens (optics) Mirror Parabola Sphere Cardinal point (optics) Focal length Ellipse Hyperbola Focus (geometry) Cassegrain reflector Telescope Accommodation (eye) Accommodation reflex Angular aperture Astigmatism Autofocus Breathing (lens) Chromatic aberration Collimator Crayford focuser Critical focus Cylindrical lens Defocus aberration Dual speed focuser Eye examination Fixed focus Focus finder Focus free lens Focus puller Hartmann mask Hyperfocal distance Internal focusing Knapp's Rule Lens (anatomy) Modified Dall-Kirkham telescope Modulation transfer function (infrared imaging) Myopia Optical format Optical telescope Parfocal lens Refractive error Scheimpflug principle Varifocal lens
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