The globe Flashcards
pg 121-123
What proportion of the globe does the anterior segment form?
1/6th
What is the radius of curvature of the AC?
roughly 8mm
What proportion of the globe does the posterior segment form?
5/6th
What is the radius of the posterior segment?
12mm
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posTerior, Temporal
Which anatomical landmark forms the anterior pole?
centre of curvature of the cornea
Which anatomical landmark forms the posterior pole?
centre of posterior curvature of the eyeball
What is the optical axis?
the line connecting the anterior and posterior poles
Also known as geometric axis
Where does the equator lie?
Halfway between anterior and posterior poles
What is the visual axis
line connecting the fovea centrals of the retina with the nodal point of the eye and continuing anteriorly through the cornea
Do the optic axis and the visual axis coincide?
NO.
fovea is temporal and slightly inferior to the posterior pole, so optical and visual axes do not coincide
What are the lengths of the following diameters:
a) the anteroposterior diameter of the eye
b) vertical diameter of the eye
c) horizontal diameter of the eye
a) 24mm
b) 23mm
c) 23.5mm
Is a patient more myopic of hypermetropic if the AP diameter of the eye is longer?
MYOPIC
Where in the orbital cavity is the eyeball found?
Anterior part, closer to the roof than the floor. Closer to lateral wall than medial wall
If a line is drawn from the superior to inferior orbital margin, what will it coincide with?
Cornea/slightly anterior to it
if a line is drawn from medial to lateral orbital rim, what proportion of the eye lies infront of it?
1/3rd
How far from the limbus do the following muscles insert into the sclera:
a) medial rectus
b) inferior rectus
c) lateral rectus
d) superior rectus
a) 5.5mm
b) 6.5mm
c) 6.9mm
d) 7.7mm
How far from the limbus does the medial rectus insert into the sclera?
5.5mm
How far from the limbus does the inferior rectus insert into the sclera?
6.5mm
How far from the limbus does the lateral rectus insert into the sclera?
6.9mm
How far from the limbus does the superior rectus insert into the sclera?
7.7mm
The volume of the globe is:
a) 15ml
b) 3 ml
c) 6.5ml
d) 12ml
c) 6.5ml
What is the anteroposterior diameter of the eye
24mm
What is the vertical diameter of the eye
23mm
What is the horizontal diameter of the eye
23.5mm
