21 VT Operational Name, Portion of Visual Pattern Tested, & Spatial Direction Flashcards
ON: Base-in prism needed for vertical alignment of dissociated images
VT 3 and 13a
Plus sphere needed for flicker neutralization of motion while patient is fixating at far
VT 4
Plus sphere needed for flicker neutralization of motion while patient is fixating at far at 20 inches
VT 5
Plus sphere needed for flicker neutralization of motion while patient is fixating at far at 40 inches
VT 6
Maximum plus to standard acuity while patient fixates target at 20 feet
VT 7
Same as Test No. 3 performed thru No. 7
VT 8
Base-Out prism to 0.25D blur at far
VT 9
Base-Out to Break and Recovery at far
VT 10
Base-In to Break and Recovery at far
VT 11
Same as Test No. 13A performed thru No. 7
VT 13b
Maximum plus to equality of line target under dissociation thru cross-cylinder
Vt 14a
Base-In prism to vertical alignment of dissociated line target thru 14A
VT 15a
Maximum plus to equality of line target under fused conditions thru cross cylinders
VT 14b
Same as 15A, Control lenses 14B
VT 15b
Base-Out to blur out at near on reduced 20/20 Snellen
VT 16a
Base-Out to Break and Recovery at Near
VT 16b
Base-In prism to blur out at near on reduced 20/20 Snellen
VT 17a
Base-In to Break and recovery at Near
VT 17b
Minus sphere to blur on 0.62em type at 13 inches
VT 19
Minus sphere to blur out at near on reduced 20/20 Snellen
VT 20
Plus sphere to blur out at near on reduced 20/20 Snellen
VT 21
Portion of Visual Pattern tested: VT 4, 5, 6, 7, 14a & b, 19, 20, 21
ACCOMMODATION
Portion of Visual Pattern tested: VT 3, 13a, 8, 9, 10, 11, 13b, 15a & b, 16a & b, 17a & b,
CONVERGENCE
Probing used on: VT 3, 13, 4, 5, 6, 7, 8, 11, 13b, 14a & b, 15a & b, 17a & b, 21
Spatial direction?
INHIBITION
Away from the plane of regard
Probing used on: VT 9, 10, 16a & b, 19, 20
Spatial direction?
STIMULATION
Towards the plane of regard
In visual pattern tested, Accommodation is secondary to Convergence in these 3 VTs.
VT 10, 16b, 17b
