Opt 114 function: vitreous, choroid

how many functions does the vitreous have

5

what is the main function of the vitreous

to transmit and refract light, and focus light on the retina

what features of the vitreous give it the properties to transmit and refract light

low concentration of particles and interfibrillar spacing

due to the viscoelastic properties of the vitreous, what function does it have

shock absorber

how is the vitreous a shock absorber

it alters shape to comply with external forces

the vitreous exists between the posterior and the anterior segments of the eye, hterefore, it functions as what

a diffusion barrier between the two

how does the vitreous affect aqueous diffusion

it diffuses very slowly because of the gel like properties

how does the vitreous affect medication diffusion

prevents topical medications (drops) from reaching the retina/optic nerve in significant concentrations

there are two functions of the vitreous that are of limited significance (there is no damage if vitreous is removed), what are they?

holds teh retina next to RPE, stores metabolites for retina/lens

what is more important for holding the retina to the RPE

IOP

what metabolites does the vitreous store for teh retina/lens

glucose, vitamin C

list the 5 functions of the vitreous

transmit/refract light

shock absorber

diffusion barrier

holds the retina next to RPE

stores metbaolites for retina/lens

how many functions does the choroid have

3

what is the main function of the choroid

provide nutreints to and remove waste from the outer retinal layers

what are the two secondary functions of the choroid

absorb excess visible light and thermoregulation of the retina

how does the choroid absorb excess visible light

the heavy pigmentation of it

why does the choroid need to absorb excess visible light

to prevent the light reflecting back through the retina and affecting image quality

what outer retinal layers does the choroid supply with nutrients

RPE, photoreceptors