intro to eye and visual system

Question 1

cornea

Answer 1

• thin in large eyes and those with myopia
• thick in small eyes and those with hyperopia
• main refractive component of eye
• refractive error dependent on curvature
• avascular receivers nutrients from aqueous humour

Question 2

measuring corneal curvature

Answer 2

keratometry
corneal topography
- diagnosis of corneal pathology

Question 3

measuring refractive error

Answer 3

retinoscopy
- cornea and lens focus on light in front or behind retina
- retinoscopy involves moving light across popular ti determine where light being focused
- lenses used to move focus onto retina

Question 4

lens

Answer 4

• forms part of refractive component of eye
• enables focus between near and far
• stiffens with age

Question 5

pathological conditions of fundus
optic disc, macula etc

Answer 5

optic disc- glaucoma
macular- amd
general- diabetic retinopathy

Question 6

clinical examination of fundus

Answer 6

• direct ophthalmoscopy
• binocular indirect opthalmoscopy
• slit lamp
• fundus photography

Question 7

why is it important to know about non ovular structure and function?
and eye defects can be side affect of certain diseases such as

Answer 7

• symptoms can have an effect on visual system
• stroke
• trauma
• brain tumour