Midterm Flashcards
What does rose Bengal do
Stains devitalized cells
Which of the following slit lamp illuminations is used to observe corneal thickening, thinning, and the depth of scars?
Optic section
Which of the following slip lamp illuminations is used to observe fluorescein patterns?
Diffuse
Which of the following slit lamp filters should b used to observe neovasvularization?
Red free
Which of the following illuminations would be used to detect vertical striae?
Direct focal parallelpiped
In addition to direct focal, which of the following illuminations should be used to observe a pinguecula?
Indirect
Fluorescein which has been instilled into the eye is best illuminated by?
Cobalt
Which of the following slit lamp illuminations is best to view the endothelium?
Speculation reflection
Which illumination would be used to detect disturbances in the normal corneal transparency
Sclerotic scatter
Who described the idea of neutralizing the front surface of the cornea in 1508?
Leonardo da Vinci
Who started looking at the cornea and found out about accommodation and astigmatism In 1801
Thomas young
Who fitted for fitted glass shell in 1887?
F.A Muller
Who fitted the first glass lens to be worn to correct vision in 1888?
A.E Fick
Who described the idea of neutralizing the front surface of the cornea in 1508?
Leonardo da Vinci
Who started looking at the cornea and found out about accommodation and astigmatism In 1801
Thomas young
Who fitted for fitted glass shell in 1887?
F.A Muller
Who fitted the first glass lens to be worn to correct vision in 1888?
A.E Fick
Who described the idea of neutralizing the front surface of the cornea in 1508?
Leonardo da Vinci
Who started looking at the cornea and found out about accommodation and astigmatism In 1801
Thomas young
Who fitted for fitted glass shell in 1887?
F.A Muller
Who fitted the first glass lens to be worn to correct vision in 1888?
A.E Fick
Who made the first all plastic contact lens In 1938? (PMMA CL)
Mullen & Obrig
Who made the first all plastic contact lens In 1938? (PMMA CL)
Mullen & Obrig
When does FDA classify a soft lens as a drug?
1968
Who discovered the use of fluorescein in the use of contacts in 1938?
Theodore Obrig
In what year did vistakon get their first disposable lens approved by the FDA?
1987
If you increase the vault what happens to the lens?
Tighter fit
If you decrease the vault of a CL what happens?
Looser fit
What lens increases the edge thickness to a CL
Myoflange
Central curve on the posterior lens surface. Expressed in radius of curvature or diopters
Base curve or CPC
Chord diameter of the base curve.
Optical zone
The shorter the radius the…
Steeper the curve
What increases with shorter base curve?
Radius or larger optical zone diameter
If you want to make a lens fit tighter u do?
Decrease base curve radius longer diameter
Curve between the base curve and peripheral curve
Secondary or intermediate curve
Outermost curve of the posterior surface of lens (longest curve)
Peripheral curve
Blends junction between CPC, IPC, & PPC. Light medium or heavy
Blend curve
Overall width from edge to edge in millimeters
Diameter
Measure in mm at the geometric center
Center thickness
What lens increases edge thickness for a plus lens
Myoflange
What lens decreases edge of a high minus contact lens
Hyper flange
Junction between anterior and posterior surface. Anterior zone posterior zone and apex
Lens edge
Base down prism to control position movement specialty
Prism ballast (topic bifocal)lenses
Removal of the inferior or superior portion of the lens for stabilization of specially lenses
Truncation
The ____ along with the posterior optical zone size determine lens vault
BASE CURVE
Soft lenses became readily available in the U.S in?
1971
Which of the following materials would be representative of a soft lens?
Hydroxyethlmethacrylate
Which individual is most responsible for the intro of a plastic corneal contact lens?
Tuohy
Which individual is most responsible for the intro of a soft contact lens?
Wichterle
Which type of rigid lens would be used to solve fitting problems created by excessive corneal astigmatism?
Bitoric
Truncation is used to stabilize _____ lenses
Bifocal
A flat curve will have a ___ radius of a curvature than a steep curve
Longer
_____ developed the first contact lens for use in keratoconus patients
Kalt
The keratometer is designed to measure the cornea at the
Visual center
The topographer does what?
Provides a computer generated map of corneal curvature
The area of the cornea with the steepest curvature is the ___
Apex
Which of the following slit lamp illuminations is best to view the endothelium?
Specular reflection
