Eye axis 22.65 is normal for an 8 year old child. The eye axis is the length between the anterior and posterior diameters of the eyeball, and it grows at a different rate each year with age. The length of the anterior and posterior diameters of the eyeball in a newborn is about 16.8 mm. From the neonatal period to about 2 years of age, the eye axis grows at the fastest rate each year, increasing at a rate of about 0.6 mm. At the age of 2-3 years the rate of increase in the length of the ocular axis is about 0.5 mm per year. between the ages of 3 and 12 years, the rate of increase in the length of the ocular axis decreases to about 0.3 mm per year, with an approximate range of 20 to 24 mm. After puberty at the age of 12-15 years, the rate of increase in axial length decreases to about 0.2mm per year, with an approximate range of 22-24mm. between the ages of 15-18 years, the rate of increase in axial length almost stabilizes at about 0.1mm per year, with an approximate range of 23-24mm, and in adulthood after the age of 18 years the axial length basically stabilizes at 24mm or less.