Download presentation
1
49 The Eye: I. Optics of Vision
Dr. A.R. Jamshidi Fard 2011
2
Visual System
3
Visual Pathway
5
EYEBALL 3 Tunics 3 Chambers Tunica Fibrosa: cornea, sclera
Tunica Vasculosa: choroid, ciliary body, iris Tunica Nervosa: retina 3 Chambers Anterior Chamber Posterior Chamber Vitreous Body
6
Light Refraction
7
Refraction of Light
8
Emmetropia بينايى طبيعى
9
Optics of the Eye
10
Ametropia نقص انکسارى بينايى
Refractive error Ametropia نقص انکسارى بينايى Near sightedness (Myopia) Farsightedness (Hyperopia) Astigmatism Presbyopia
11
Presbyopia پيرچشمى Physiologic loss of accommodation in advancing age
around 45 years of age , accommodation become less than 3 D -->reading is possible at cm difficult reading of fine print Headache Visual fatigue
12
Anisometropia ناهمسانى انکسارى چشمها
Difference in refractive power between 2 eyes
13
Nearsighted or Farsighted
14
Correction of Myopia and Hyperopia by Use of Lenses
Errors of Refraction (Normal Vision) (Farsightedness) (Nearsightedness) Correction of Myopia and Hyperopia by Use of Lenses
16
Astigmatism
17
Visual Acuity
18
Visual Acuity Test
19
Cataracts With age, lens becomes hard and opaque Diabetes mellitus
Heavy smoking Vision becomes hazy and distorted, will lead to blindness Surgical removal or glasses
20
Glocoma
23
Ophthalmoscope
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.