This model shows the optic nerve in its natural position in the bony orbit of the eye (floor and medial wall). At three times life size this eye model is great for anatomical demonstrations. The tear duct is NOT depicted. The eyeball can be dissected into: Both halves of sclera with cornea and eye muscle attachments Both halves of the choroid with iris and retina Lens Vitreous humour Eye on base. Measurements: 7.09"" x 10.24"" x 7.48"" (18cm x 26cm x 19cm) Weight: 2.43 Pounds (1.10 kg).