Adjunctive Tests and Procedures
Assesses the patient's vision in the presence of a bright light to determine if sensitivity to glare is contributing to a patient's visual symptoms.
What is brightness acuity testing (BAT)?
Refers to everything that is visible to a person at any given time.
What is the visual field?
(DOUBLE JEOPARDY QUESTION!!)
Lens that can only focus at one distance.
Single vision lens.
Defined as a best corrected visual acuity of 20/200 or less or as a visual field reduced to 20 degrees or less in the better seeing eye.
What is legal blindness?
This flexible, gel like material contains 38% to 74% water and is placed over the eye to help with clearer vision.
What is a soft contact lens?
Procedure for measuring corneal thickness.
What is pachymetry?
(DOUBLE JEOPARDY QUESTION!!)
The route of visual information from the retina to the occipital lobes.
What is the visual pathway?
A lens that has three zones: one for correcting distance vision, one for intermediate range, and one for near vision.
What is a trifocal?
Distance in which near visual acuity is measured.
What is 14-16 inches?
These less flexible corrective lenses sit over the cornea to provide clearer vision which allow direct passage of oxygen and carbon dioxide through the lens materials and allow oxygen to reach the cornea via the tear pump. Commonly seen in patients with keratoconus.
What is a rigid gas-permeable lens?
Produces detailed information concerning the corneal curvature (power), showing steeper and flatter areas and irregularities. Involves the use of a special camera that photographs a projected pattern of concentric rings (Placido disk) onto the corneal epithelial surface.
What is corneal topography?
An area of reduced sensitivity surrounded by an area of greater sensitivity.
What is a scotoma?
The distance between the pupils.
What is interpupillary distance? (Commonly called PD, PDs, or IPD)
Rule used to calculate the magnification needed to read standard newsprint (20/60 or J5 level) by low vision patients.
What is Kestenbaum's rule?
(DOUBLE JEOPARDY QUESTION!!)
This type of contact lens corrects the vision of patients whose astigmatism cannot be adequately masked by spherical contact lenses.
What is a toric contact lens?
Used to take color images of the retina and optic nerve for future comparisons and to produce black and white images during fluorescein and indocyanine green angiography.
What is fundus photography?
Condition in which the right or left half of the visual field is missing.
What is hemianopia?
The distance from the back surface of an eyeglass lens to the front surface of the patient's cornea.
What is vertex distance?
(DOUBLE JEOPARDY QUESTION!!)
A condition, if not surgically treated, is the single most common cause of blindness or low vision in the world.
What is a cataract?
This contact lens design attempts to provide individuals with correction for both near and distance vision.
What is a bifocal contact lens?
(DOUBLE JEOPARDY QUESTION!!)
An older testing device that projects a brightly lighted miniaturized Snellen acuity chart through the least dense area of an opacity onto the patient's retina.
What is a potential acuity meter (PAM)?
Concentric circles equally spaced 10 degrees from the central point providing coordinates that can be used as a reference for mapping the extent of peripheral vision.
What are the circles of eccentricity?
Used to measure the base curve of an eyeglass lens.
What is a Geneva lens clock?
Your patient is not able to see the largest optotype displayed on the Snellen visual acuity screen. This is your next step in checking the visual acuity.
What is count fingers?
Correction in which one eye (usually the dominant eye) is corrected with a contact lens for distance vision, and the other eye is corrected with a contact lens for near vision.
What is monovision?