Normal Values in Ophthalmology

NORMAL VALUES IN OPHTHALMOLOGY PARAMETER Diameter of eye ball

Antero posterior Lateral (horizontal) Vertical Axial length of eye ball At birth At 3 yrs age At 14 yrs age Circumference of eye ball Volume of eye ball Weight of eye ball Diameter of ant horizontal surface of cornea vertical Diameter of posterior surface of cornea Thickness of cornea In the centre In periphery Radius of curvature of anterior central cornea posterior Refractive index of cornea Refractive power of As a whole cornea Anterior surface Posterior surface Corneal endothelial At birth cell density Young adults decompensation Thickness of sclera Posteriorly -thickest EO muscle insertion At equator Near limbus Width of ciliary body Ant part- pars plicata Post part- pars plana Central depth of ant. Chamber Volume of aqueous humour in anterior chamber Volume of aqueous humour in posterior chamber Rate of formation of aq. humour Refractive index of aqueous humour pH of aq. humour in ant chamber Normal range of IOP Equatorial diameter At birth of lens In 2nd decade for life

VALUES 24 mm 23.5 mm 23 mm 18 mm 23 mm 24 mm 75 mm 6.5 ml 7 gm 11.75 mm 11 mm 11.5 mm 0.52 mm 0.67 mm 7.8 mm 6.5 mm 1.376 + 43 D + 48 D -5D 6000 /mm2 2400-3000 /mm2(parson 2800 /mm2) 10 sec, 0.5 mm 18-21 mm at birth, 28-30 mm adult 8 mm at birth, 9-11 mm adult 40 mm, 15 mm 29 mm,1 mm 10-11 mm 4-5 mm 20-30 in each lid, single row 2 glands associated with each cilia Between the cilia, LL>UL 12- 20 times/min 42 mm and 50 mm 3D 6D

Hypermetropia at birth Listing’s reduced eye Total dioptric power Principal point Nodal point Anterior focal point Posterior focal point Ant & post focal length

2.5 D + 60 D 1.5 mm behind ant. surface of cornea 7.2 mm behind ant surface of cornea 15.7 mm in front of ant surf of cornea 24.4 mm behind ant surf of cornea 17.2 (15.7+1.5) & 22.9 (24.4-1.5)