3 - Intro to VT Flashcards
VT Sequence
1) spec rx
2) added lenses (accomm insuff, CE)
3) prism (DI, vert phoria)
4) occlusion
5) VT
6) sx
Feedback mechanisms: diplopia
Not aligning eyes appropriately
Feedback mechanisms: blur
Over/under-focusing
Feedback mechanisms: luster
Perception of a combo of colors seen when fusing
Feedback mechanisms: kinesthetic awareness
Able to explain what they’re feeling (strain, relax, etc.)
Feedback mechanisms: localization
Ability to point to where the target appears to be during fusion
Based on physiological diplopia
Feedback mechanisms: float
Perception of target floating closer/farther
Part of SILO
Convergence = closer Divergence = farther
Feedback mechanisms: SILO
As convergence demand incr, target gets smaller & moves in
Opposite for divergence
SOLI can be seen in older kids/adults due to cues for distance perception and prior experience
Feedback mechanisms: parallax
Appreciation of movement of the fused target as the pt moves
Convergence = same direction Divergence = opposite direction
VT classifications: stereoscopes (4)
Brewster
Wheatstone
Haploscope
Cheiroscope
VT classifications: anaglyphs & polaroid (5)
Tranaglyphs Vectograms Bar readers TV trainer Computer programs with R/G
VT classifications: lenses & prism (4)
Flip & loose lenses
Flip & loose prisms
Prism bars
Hand-held mirrors
VT classifications: septa & apertures (3)
Aperture rule
Remy separator
Tasks based on Turville test
VT classifications: afterimages, entopic phenomenon, & electrophysiology (4)
Afterimage devices
Maxwell spot
Haidinger brush
Auditory feedback
VT classifications: paper, pencil, & miscellaneous (7)
Lifesaver,free space, barrel, & 3-dot cards Eccentric circles Brock string Computer techniques Hart chart Letter tracking Tracing
