Soft Lenses Flashcards
The thickness of a soft lens will affect the
A. Power
B. Visual Acuity
C. Oxygen transmissibility of the lens
D. Opaque tint
Oxygen transmissibility of the lens
Soft lens fitting should result in
A. Apical clearance
B. 3- Point touch
C. Upper lid attachment
D. Lens decentration
3-Point Touch
If the HVID is 11.5mm, the minimum diameter soft lens you should choose is
A. 12.5mm
B. 15.0mm
C. 13.0mm
D. 13.5mm
12.5mm
(HINT: HVID + 2mm = diameter)
The sagittal depth of a soft lens is determined by
A. Base curve and thickness
B. Diameter and power
C. Diameter and water content
D. Base curve and diameter
Base curve and diameter
Which characteristic of a soft lens does not affect the fit?
A. Diameter
B. Sagittal Depth
C. Tint
D. Water Content
Tint
The most effective method to objectively asses the fit of a soft contact lens is
A. Asking the patient how it feels
B. Push up test
C. Fluorescein evaluations
D. Slit-lamp observation with optic section
Slit-lamp observation with optic section
If all of the following soft lenses are made with the same design and material, which should have the greatest sagittal depth?
A. 8.4 / 14.0
B. 8.4 / 14.5
C. 8.8 / 14.0
D. 8.8 / 14.5
8.4 / 14.5
Transpose this Rx:
-4.00 +1.00 x 005
A. -4.00 -1.00 x 095
B +3.00 -1.00 x 005
C. -3.00 -1.00 x 095
D. -3.50 DS
-3.00 -1.00 x 095
The biggest advantage that soft lenses provide over gas permeable lenses is
A. Enhanced comfort
B. Sharper vision
C. Higher oxygen transmission
D. Lower incidence of GPC
Enhanced comfort
Which is not a factor that can affect oxygen permeability of soft lenses?
A. Deposit resistance
B. Water content
C. Center thickness
D. Tint
Tint
Three-Point Touch means
A. Use three fingers when doing the push up test
B. Lens touches center of the cornea and at the two opposite edges on the sclera
C. Lens touches the upper lid, lower lid, and cornea
D. Instruct the patient to use three fingers for lens insertion
Lens touches center of the cornea and at the two opposite edges on the sclera
GPC stands for
A. Giant Papillae Condition
B. Grand Power Collagen
C. Giant Papillary Conjunctivitis
D. Great Potential Conjunctiva
Giant Papillary Conjunctivitis
Given the following information:
Spectacle Rx: -2.50 +1.50 x 060
Which toric lens would be selected first?
A. -1.00 -1.25 x 150
B. -2.50 -1.25 x 060
C. -1.00 -1.25 x 060
D. -2.50 -1.75 x 150
-1.00 -1.25 x 150
Given the following information:
Spectacle Rx: +1.50 -2.00 x 040
Which toric lens would be selected first?
A. +2.00 -1.75 x 040
B. +1.50 -1.75 x 130
C. +0.50 -1.75 x 130
D. +1.50 -1.75 x 040
+1.50 -1.75 x 040
Initial selection of a soft lens diameter is decided by measuring the HVID. What does this stand for?
A. Highest Visible Initial Diameter
B. Horizontal Visible Iris Diameter
C. Hydrogel Viewing Interstromal
D. Horizontal Vertical Iris Diameter
Horizontal Visible Iris Diameter
