Eye of a newborn is ?
Ans. is 'b' i.e., Hypermetropic Eye at bih Anteroposterior diameter of eye ball is about 16.5 mm (70% of adult size). Adult size is attained by 7-8 years. Corneal diameter is about 10 mm. Adult size (11.7 mm) is attained by 2 years of age. Anterior chamber is shallow and angle is narrow. Lens is spherical at bih. Retina : - Apa from macular area, the retina is fully differentiated. Macula differentiates 4-6 months after bih. Myelination of optic nerve fibres has reached the lamina cribrosa. New born is usually hypermetropic by +2 to +3D. Orbit is more divergent (50deg) as compared to adult (450). Lacrimal gland is still underdeveloped and tears are not secreted.
Emmetropic
Hypermetropic
Myopic
Astigmatism