如果採用 Code V 軟體，那麼可以用 SAGF 函數計算面深(Sag)量： ZO/Jf Jn~
SAGF(surface_num, zoom_pos, x_coord, y_coord) - Sag of the designated surface at x_coord, y_coord [ dVBsi
gm,AH85
如果想知道的是某一非球面的型狀是否能由干涉儀測量，那麼 Code V 提供兩個函數: 0,)2\`99#k
T [xIn+w
(1) 使用 Zygo 干涉儀 0>BI [x@
函數 @VFA(zoom #, surface #, height) %qo.n v
Surface is testable for @VFA < 1.0 1\UU"
Surface is not testable for @VFA > 1.0 $:oC \K6
~Gmt,l! b
(2)使用 QED 干涉儀 ZiQ<SSo:
函數 @SSIa(surface #, zoom #, height) )D #} /3s
0 <= @SSIa < 0.5 - surface is readily testable 4H, c;g=!
0.5 <= @SSIa < 1 - surface is marginally testable :L+ xEL
@SSIa >= 1 - surface is difficult to test
