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The hydrodynamic radii of intravitreal anti-VEGF drugs ranibizumab, aflibercept and bevacizumab were measured with time-resolved fluorescence anisotropy. The molecules were labeled with Ruthenium-based dye, whose lifetime of several hundred nanoseconds is comparable to the rotational correlation time of these molecules. The molecular hydrodynamic  radii were obtained calculated  from the rotational correlation times of the molecules measured obtained  with time-resolved fluorescence anisotropy measurements. The measured radii of 2.76$\pm$0.04~nm for  ranibizumab,aflibercept and bevacizumab, 2.76$\pm$0.04~nm,  3.70$\pm$0.03~nm for aflibercept  and 4.58$\pm$0.01~nm, respectively, 4.58$\pm$0.01~nm for bevacizumab  agree with calculations based on molecular weight. Anisotropy offers an alternative independent means of determining the size of drugs designed for intraocular use and may better reflect ocular drug diffusion than theoretical estimates of size based solely on MW.