physiology of vision

PDF 58 sahifa 2,9 MB Bepul yuklash

58 sahifa

FaylHub.uz

Telegram orqali yuklab olish

Hajm 2,9 MB

Fayl turi PDF

Sahifalar 58

Yangilangan Dek 2025

Sahifa ko'rinishi (5 sahifa)

Pastga aylantiring 👇

1 / 58

$008-vision.ppt physiology of vision sinan canan, phd sinancanan@gmail.com www.sinancanan.net vision: a visual representation of reality optics of vision – refraction • refractive power – dioptre • 1/(focal length; f) • f = 1 m; 1 dioptre • f = 0.5 m; 2 dioptres • f = 5 m; 0.2 dioptres • negative power for concave lensest • path of light in the eye: • cornea (2/3 of the refractive power!) • aqueous humor • lens • vitrous humor • retina optics of vision eye as a “camera” • “reduced eye” (accomodated for distant vision) • total refractive power = 59 dioptres • lens – 20-34 dioptres (accomodation) aqueous humor and the lens aköz (aqueous) humor ve mercek fluid system of the eye • intraocular pressure • 12-20 (mean: 15) mmhg • pathological increase (glucome) – loss of sight – blindness! accomodation accomodation (video) physical imperfections of lenses • chromatic abberation …$

2 / 58

en ve blue • intracellular discs: visual pigments • pigmented epithlial layer • melanine granules • prevents reflection retina retina retina retina pigment layer photoreceptor layerı (“cones” and “rods”) external limiting lamina outer nuclear layer outer pelxiform layer inner nuclear layer inner plexiform layer ganglion layer inner limiting lamina light retina: detaylar pigment layer photoreceptor layer outer limiting lamina outer nuclear layer outer plexiform layer inner nuclear layer innr plexiform layer ganglion layer inner limiting lamina light retina: photoreceptors retina: photoreceptors phototransduction (conversion of light to nerve signal) na+ phototransduction (conversion of light to nerve signal) phototransduction (conversion of light to nerve signal) • rhodopsin phototransduction (conversion of light to nerve signal) light change in photopigment metarodhopsin ii activation of transducin ( g-protein) activation of phosphdiestrases decreased cgmp closure of na channels hyperpolarization, decreased release of nts action potential… phototransduction (conversion of light to nerve signal) retinal receptor density fovea …

3 / 58

n cells: • w: 40%; 8m/sec, large reseptive areas [coarse vision, detection of movement direction] • x: 55%; 14m/sec, small receptive areas [sharp vision, color vision] • y: 5%; 50m/sec, large receptive areas [detection of rapid changes in viasual field] ganglion cells color perception – color consistency color perception – color consistency renk algılanması – renk tutarlılığı mavi kırmızı sarı kırmızı renk algılanması – renk tutarlılığı mavi kırmızı sarı kırmızı vision pathways vision pathways – visual cortex light and biorhythms – melanopsin cells belenky, m.a., smeraski, c.a., provencio i., sollars, p.j. and pickard, g.e. (2003) melanopsin retinal ganglion cells receive bipolar and amacrine cell synapses. j. comp. neurol., 460, 380-393. finished... 

4 / 58

5 / 58

Ko'proq o'qimoqchimisiz?

Barcha 58 sahifani Telegram orqali bepul yuklab oling.

To'liq faylni yuklab olish

"physiology of vision" haqida

008-vision.ppt physiology of vision sinan canan, phd sinancanan@gmail.com www.sinancanan.net vision: a visual representation of reality optics of vision – refraction • refractive power – dioptre • 1/(focal length; f) • f = 1 m; 1 dioptre • f = 0.5 m; 2 dioptres • f = 5 m; 0.2 dioptres • negative power for concave lensest • path of light in the eye: • cornea (2/3 of the refractive power!) • aqueous humor • lens • vitrous humor • retina optics of vision eye as a “camera” • “reduced eye” (accomodated for distant vision) • total refractive power = 59 dioptres • lens – 20-34 dioptres (accomodation) aqueous humor and the lens aköz (aqueous) humor ve mercek fluid system of …

Bu fayl PDF formatida 58 sahifadan iborat (2,9 MB). "physiology of vision"ni yuklab olish uchun chap tomondagi Telegram tugmasini bosing.

Teglar: physiology of vision PDF 58 sahifa Bepul yuklash Telegram