EOM
Match
1. Abduction A. Both eyes move nasally
2. Elevation B. Eye rotates toward the nose
3. Convergence C. Eye moves temporally
4. Intorsion D. Eye moves up
1 Abduction = C moves temporally
2 Elevation = D eye moves up
3 Convergence = Both eyes move nasally
4 Intorsion = eye rotates toward the nose
What is the name of the gel like fluid that occupies 80% of the eye?
Vitreous
(Body = the gel component)
(Humor = liquid portion)
Match
1. Depression A. Both eyes move temporally
2. Extorsion B. Eye moves nasally
3. Divergence C. Eye moves down
4. Adduction D. eye rotates away from the nose
1 Depression = C eye moves down
2 Extorsion = D eye rotates away from the nose
3 Divergence = A both eyes move temporally
4 Adduction = B eye moves nasally
What is the biggest concern with a posterior vitreous detachment (PVD)?
A. Bleeding in the back of the eye
B. Vitreomacular traction
C. A retinal detachment
D. Gradual progressive vision loss over time
What will the patient say they see if they are currently experiencing a PVD?
C. A retinal detachment is the biggest concern
A is possible, but highly improbable, B is the wrong location for a PVD, D is describing glaucoma and not a PVD
A patient will typically say they suddenly experienced blurry vision with a flash of light and a subsequent floater. This is typically in the temporal field of vision for either the right or left eye.
True/False
A phoria is an eye turn that cannot be compensated for with the eye muscles
False!
A tropia like exotropia, or hypertropia cannot be compensated for.
What direction is Eso?
True/False
The rods are better at interpreting movement and in dim light settings.
True
There are 3 cones; red, green, blue and the combination of these three activating grant us the ability to perceive color from 380 nm to 750 nm. The density of the 1/1 ratio for cones within the fovea allows us to perceive the greatest detail, whereas the frequency of 10 or 100/1 with rods helps to perceive movement.
What is the name of the extraocular muscle that is the largest? What does it do, and why is it the largest?
The medial rectus is the muscle that is closest to the nose and is the largest.
It contracts the eyes nasally (convergence) during accommodation so we see near objects as single. This muscle is used the most because we use our near vision often.
Which layer of retina converts light into chemical signals?
A. Nerve fiber layer (rNFL) B. Outer plexiform layer
C. Ganglion cell layer D. Photoreceptor
E. Retinal pigmented epithelium (RPE)
D. Photoreceptor
Which muscle causes excyclotorsion?
A. Superior Rectus B. Superior oblique
C. Lateral rectus D. Medial rectus
E. Inferior oblique F. Inferior rectus
At what position of gaze is it most active?
E. inferior oblique's main mechanism of action is excyclotorsion.
All obliques are most active when the eye is pointing towards the nose.
This retinal condition is a build-up of waste deposits within the retina. It will cause central vision loss and can either be dry (no blood) or wet (with blood).
What is the name of this condition, and which layer of retina is impacted?
Age-related macular degeneration (ARMD)
The retinal pigmented epithelium (RPE) is where the exchange of nutrients and waste deposits occurs. Therefore, if the waste is building up, the RPE cells are the ones being impacted.