如果採用 Code V 軟體，那麼可以用 SAGF 函數計算面深(Sag)量： ;Jh=7wx
SAGF(surface_num, zoom_pos, x_coord, y_coord) - Sag of the designated surface at x_coord, y_coord 2O|jVGap5x
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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: c@eQSy
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(1) 使用 Zygo 干涉儀 kn$2_I9
函數 @VFA(zoom #, surface #, height) p(B^](?
Surface is testable for @VFA < 1.0 xqZZ(jZ
Surface is not testable for @VFA > 1.0 I_?+;<n
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(2)使用 QED 干涉儀 |M8FMH[_
函數 @SSIa(surface #, zoom #, height) |:H
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0 <= @SSIa < 0.5 - surface is readily testable y cT@ D/
0.5 <= @SSIa < 1 - surface is marginally testable EgE% NY~
@SSIa >= 1 - surface is difficult to test
