希臘字母：Α,Β,Γ,Δ,Ε,Ζ,Η,Θ,Ι,Κ,  Λ ,Μ,Ν,Ξ,Ο,Π,Ρ,Σ,Τ,Υ,Φ,Χ,Ψ,Ω.
Incomitant strabismus of the eso- or exo-type are classified as `` alphabet patterns '' : they are denoted as A- or V- or more rarely  λ - , Y- or X-pattern depending on the extent of convergence or divergence when the gaze moves upward or downward .
两词在上述语境中含义相同。