如果採用 Code V 軟體，那麼可以用 SAGF 函數計算面深(Sag)量： O ;dtz\
SAGF(surface_num, zoom_pos, x_coord, y_coord) - Sag of the designated surface at x_coord, y_coord 0lm7'H*~
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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: %Y:"5fH
Ok V*,n
(1) 使用 Zygo 干涉儀 h7"c_=w+
函數 @VFA(zoom #, surface #, height) P\lEfsuR
Surface is testable for @VFA < 1.0 L]kd.JJvy
Surface is not testable for @VFA > 1.0 _* m<Z;Et
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(2)使用 QED 干涉儀 psFY=^69o
函數 @SSIa(surface #, zoom #, height) n LD1j
0 <= @SSIa < 0.5 - surface is readily testable Id}/(Pkq
0.5 <= @SSIa < 1 - surface is marginally testable ``?79 MJ5
@SSIa >= 1 - surface is difficult to test
