如果採用 Code V 軟體，那麼可以用 SAGF 函數計算面深(Sag)量： p4
=/rkq
SAGF(surface_num, zoom_pos, x_coord, y_coord) - Sag of the designated surface at x_coord, y_coord hS&l4 \I'Z
gY8$Rk
%
如果想知道的是某一非球面的型狀是否能由干涉儀測量，那麼 Code V 提供兩個函數: 5 7-Hx;
=1@LMIi5x
(1) 使用 Zygo 干涉儀 C511 hbF
函數 @VFA(zoom #, surface #, height) s^K2,D]P
Surface is testable for @VFA < 1.0 ^3 9lUKL
Surface is not testable for @VFA > 1.0 cv G*p||
H2+b3y-1a]
(2)使用 QED 干涉儀 *0to,$ n
函數 @SSIa(surface #, zoom #, height) E&eY79
0 <= @SSIa < 0.5 - surface is readily testable `G_~zt/
0.5 <= @SSIa < 1 - surface is marginally testable G]4Ca5;Z!N
@SSIa >= 1 - surface is difficult to test
