如果採用 Code V 軟體，那麼可以用 SAGF 函數計算面深(Sag)量： i8 3[':
SAGF(surface_num, zoom_pos, x_coord, y_coord) - Sag of the designated surface at x_coord, y_coord Yy6$q\@rV
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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: (OA4H1DL^
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(1) 使用 Zygo 干涉儀 Ivj=?[c|
函數 @VFA(zoom #, surface #, height) 4u"Bll
Surface is testable for @VFA < 1.0 f8`dJ5i
Surface is not testable for @VFA > 1.0 k[,0k P;
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(2)使用 QED 干涉儀 Ps{vN
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函數 @SSIa(surface #, zoom #, height) J_.cC
0 <= @SSIa < 0.5 - surface is readily testable tw&v@HUP
0.5 <= @SSIa < 1 - surface is marginally testable &b7_%,Bx4
@SSIa >= 1 - surface is difficult to test
