Introcular pressure, ocular alignment, refractory issues Flashcards
What is another name for Heterotropia?
Strabismus
What is it called when one eye is elevated relative to the other?
Hypertropia
What is it called when one eye is depressed relative to the other?
Hypotropia
What is it called when one eye is abducted relative to the other eye?
Exotropia
What is it called when one eye is adducted relative to the other eye?
Esotropia
T/F: All heterotropias can lead to double vision and possibly cortical blindness
True
What is defined as a protrusion of the globe greater than 18mm?
Exophthalmos
What is defined as a protusion equal to or less than 18 mm
Protusion
What is defined as recession of eye into orbit?
Enophthalmus
What is it called when patients have appropriate refraction
Emmetropic
What is it called when patients have refractory errors?
Ametropic
What is the normal refracting power of the human eye?
65 diopters (45 from cornea and 20 from lens)
What is the average axial length of the human eye?
24mm
What Refractory Error results from a mismatch between the refracting power of the optical elements of the eye and the axial length of the globe when neither of these components lies outside the normal range?
Physiologic Myopia
What Refractory Error is a heritable condition in which the eye is abnormally long with normal refracting apparatus?
Pathologic Myopia
What is the refractory error in pathologic myopia?
> 8.0D
What Refractory Error is an Ametropic condition when the refracting power of the eye is insufficent to bring the focused image of an object held at infinity onto the retina: the image lies posterior to the retina (normal retina, weak power).
Hyperopia (farsightedness)
T/F: Hyperopia is normal in infants
True
Who relies on accommodation to focus on near?
Emmotropes
What is the refractive error that the far point is at infinity and the focal point is at the retina?
Emmetropia
What is the refractive error that the far point is the front of the eye and the focal point is in the vitreous?
Myopia (nearsightedness)
What is the refractive error that focal point is behind the eye?
Hyperopia (farsightedness)
What kind of Hyperopia is it when the length of eye is TOO SHORT for refractive power of eye?
Axial Hyperopia
What kind of Hyperopia is it when the refractive power of eye is TOO WEAK for eye of normal length?
Refractive Hyperopia
What kind of Myopia is it when the length of the eye is TOO LONG for normal refraction?
Axial Myopia
What kind of Myopia is it when the refractive power of eye is TOO STRONG for eye of normal length?
Refractive Myopia
