Objective: The aim of this study was to compare the macroscopic measurements of the human, wolf and eagle bulbus oculi.

Materials and Methods: We used bulbus oculi of humans, wolves, and eagles. The bulbus oculis were enucleated by a previously described method. Then the largest diamater of each sample was measured macroscopically in vertical, transverse, and sagittal axes.

Results: The mean vertical measurement values of the bulbus oculi of the human, wolf, and eagle were 24.54±0.71 mm, 24.84±0.33 mm and 31.33±3.03 mm respectively. In the same order, the diameters of transverse axis were 25.07±0.14 mm, 24.69±0.29 mm and 32.68±4.91. The mean measurement of the eagle bulbus oculi was longer than those of the others (28.28±4.82 mm) while the mean sagittal measurement values of the human and wolf bulbus oculi were 24.85±0.82 mm and 21.77±1.50 mm. Vertical and transverse axes measurement of the eagle bulbus oculi was significantly longer than those of the human and wolves' bulbus oculi (for all of them P=0.008). The sagittal axis measurement of the eagle bulbus oculi was significantly longer than that of the wolf bulbus oculi (P=0.008).

Conclusion: The diameters of the eagle bulbus oculi in vertical, transverse, and sagittal axes were foundto be longer than those of the human and wolf bulbus oculi. Since the bulbus oculi of the eagle is bigger than those of the human's and wolf's, it may be more effective in terms of the amount of light reflected on the retinal surface. Bigger bulbus oculi may provide better vision due to increased visual ac