• 3D image formation is analyzed via transfer functions and point-spread function (PSF) analysis, enabling deconvolution and prediction of axial and 3D resolution in confocal microscopy [3], [5], [12], [16], [11].

• Detector aperture size, finite detector effects, and detector signal integration are identified as primary determinants of optical sectioning and resolution in confocal imaging [1], [11], [20], [9], [18].

• Axial-resolution enhancement strategies using advanced illumination/detection configurations (e.g., 4Pi, nonlinear, near-field) are demonstrated to significantly improve depth localization [19], [14], [15].

• Advanced detection architectures, including array detectors and SLM-based optical sectioning, increase photon efficiency and enable higher-quality 3D reconstructions [9], [18], [7].

• Computational imaging and image restoration approaches—PSF-based deconvolution, holographic Fourier methods, and turbulence-aware reconstructions—underpin 3D optical imaging [12], [17], [8].