Most common cataract in new born is:
A i.e. Zonular Punctate or blue dot cataract is the most common manifestationQ, & in minute degrees, is almost universal in occurrence. It usually forms in first two decades of life. Zonular or lamellar cataract accounts for 50% (most common) of all visually significant congenital cataract. Q On the basis of Parsons' and Kanski: Cataract Feature Punctate (Blue dot) Most common Cataract congenital cataracts Lamellar or Most common Zonular Cataract visually significant congenital cataracts Now lets see what a few other books have to say about these two varieties: Cataract Khurana Neema Punctate (Blue Usually forms in the 1st 2 It is very frequent. dot) Cataract decades of life. No comment on incidence. Lamellar or It is the most common type It is the most common type of Zonular Cataract of congenital cataract developmental cataract accounting for 50% of cases. accounting for 50% of cases Despite these obvious contradictions it would be preferable to go for Punctate (Blue dot) cataract as the most common variety, as is stated in the two of the most reputed books. Bilateral & symmetrical, round, grey-white circumferential lamellar shell of opacity around the clear fetal (embryonic) nucleus, which also is surrounded by clear zone (i.e. area within and around the cataract is clear) and coical riders (radial opacities or spoke of wheels) are characteristic features of lamellar (zonular/ perinuclear) cataract. Developmental Cataract may present - At bih (Congenital Cataract) - During fuher development: Infancy to Adulthood The location of the cataract in paicular layer of the lens is an indicator of the stage of development of the cataract i.e the earliest cataracts lie in the nucleus whereas the latest ones in the superficial coex.
Zonular
Morganian
Ant. Polar
Post. Polar