Feeling the eyeball shrinking inward may be caused by congenital microphthalmia, traumatic factors, eye diseases and so on. 1. Congenital small eyeballs: mainly caused by congenital factors, genetic factors or infections at birth, resulting in the eyeballs can not be fully developed, and the eyeballs may lose development and lead to atrophy, and feel the eyeballs shrinking inward. 2. Traumatic factors: after being stimulated, the eyeball content is lost a lot, and the eyeball will shrink and become smaller. 3. Eye diseases: retinopathy leads to the gradual loss of retinal function, which will cause eyeball atrophy over time. Atrophy of the eyeball not only affects the appearance, but also affects the vision, we should go to the hospital in time to find out the cause and then targeted treatment.