Ocular volume (OV) estimation is important for proper diagnosis and management of eye diseases such as microphthalmos, buphthalmos, macrophthalmos, orbital tumours and refractive errors such as myopia and hypermetropia. B-scan ultrasound gives very useful information when visualizing the intraocular structures such as the lens, vitreous body, retina, choroid and sclera. Magnetic resonance imaging (MRI) and computed tomography (CT) of the eyeball give a clearer image compared to ultrasound images, though they are very expensive. Other methods such as radiography, angiography, photography, gravimetric methods can also be used in ocular biometry. For this manuscript, several published materials were searched for and necessary information related to the key words in this topic were sorted out and orderly written systematically. This review summarizes the most recent methods of OV measurements and estimation as well as highlighting the merits and demerits of each method. The limitations of the formulae for estimating OV was used to make recommendations for future research

Keywords : Ocular Volume; Ophthalmology; B-mode Ultrasound; Magnetic Resonance Imaging; Computed Tomography.