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Cup disc ratio

Ratio of the size of optic cup to that of the optic disc Normally 0.3 to 0.4 Increased in case of glaucoma – known as cupping

Definitions

Optic cup

White, cup shaped area in the centre of the optic disc The size of the cup relative to the disc (cup to disc ratio) increases in glaucoma and

Ophthalmology

Lamina cribrosa sclerae

The fibers comprising the optic nerve exit the eyeball through a opening in the sclera in its posterior aspect. This opening is is covered by a mesh –

Ophthalmology

Vitreoretinal degenerations include the following conditions: Wagner syndrome Stickler syndrome Favre Goldmann syndrome Familial exudative vitreoretinopathy Erosive vitreoretinopathy Dominant neovascular inflammatory vitreoretinopathy Dominant vitreoretinochoroidopathy Wagner syndrome It is

Acronyms

ERG – acronym

Electroretinography

Definitions

Absolute scotoma

An area of the visual field in which there is complete loss of perception of light

Ophthalmology

Retinoschisis

Separation within the sensory retina Occurs at the level of the outer plexiform layer and the inner nuclear layer Can be congenital or acquired Seen as a transparent,

Definitions

Relative scotoma

An area of the visual field in which the loss of vision is partial or may involve light of certain wavelength Seen in shallow retinal detatchment

Ophthalmology

Vitreous humor anatomy

Vitreous humor is the transparent, jelly like visual media occupying the posterior 4/5 of eyeball Volume – 4ml Formed of randomly arranged collagen fibers with spheroidal macromolecules of

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