COA flashcards
The ability of human vision to discern shapes by their relative lightness and darkness
Contrast Sensitivity
The diffusion of oxygen through a contact lens material
DK Value
What are the two measurements required for a contact lens fitting?
Refraction and K-Reading (Keratometry)
Insufficient oxygen to the cornea often caused by the over wearing of contact lenses
Hypoxis Opthalmia
Find the spherical equivalent of
-1.00-0.50x180
-1.25 sphere
The spherical equivalent is found by taking the sphere and adding one half of the cylinder.
What is the adequate way of measuring the limbus-to-limbus value
A millimeter rule
Removal of the vitreous and then placing a gas or oil bubble to hold the shape of the eye
Vitrectomy
The use of a laser to coagulate blood and stop retinal bleeding
Photocoagulation
A laser surgery that makes a hole in the iris to lower IOP
Iridotomy
A laser surgery to make a hole in the limbus creating a new pathway for fluid to reduce IOP
Trabeculectomy
When a dying part of the cornea is replaced with a donor cornea
Keratoplasty/ Corneal Graft/ Corneal Transplant
Removal of tissue that has grown over or within the layers of the cornea
Pterygium Excision
The smallest object resolvable by the eye at a given distance
Visual Acuity
The angle that an object’s outermost rays subtend on the retina and is measured by degrees or minutes
Visual angle
Letters, numbers, pictures, etc. used on standard visual acuity charts
Optotypes
Death of the retina
Diabetic Retinopathy
The growth of new blood vessels
This is called proliferation, those with PDR (proliferative diabetic retinopathy) are typically given Anti-VEGF (vascular endothelic growth factor) injection or laser treatments are used to stop the overgrowth of new blood vessels.
Blood in the Vitreous cavity
Vitreous Hemorrhage
The junction of the corneal and conjunctival epithelia where the epithelium gradually becomes thicker towards the sclera
Limbus
The tissue that forms a fluid reservoir after a trabectome surgery
Bleb
Death of the optic nerve
Glaucoma which can be associated w/ high IOP. Glaucoma is most commonly treated w/ pressure lowering gtts.
The three common causes of eye infection
1.Bacterial
2.Fungal
3.Viral
Diagnostic testing to create 3D digital images of the optic nerve and the retina
Tomography
An eye care professional who routinely fills eye glass prescriptions is the…
Optician
