Near fixation distance in AC/A ratio

[electiveresearch2]

Hello,

Quick question. In the accommodation convergence/accommodation (AC/A) ratio calculation, what is near fixation distance (dioptres)?

AC/A = IPD + (Dn - Dd)/F

IPD = Interpupillary distance in centimetres.
Dn= Latent deviation for near (1/3m.) in prism dioptres.
Dd = Latent deviation for distance (6m.) in prism dioptres.
F= Distance of near fixation in dioptres.

Thanks in advance!

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[backrow]

If your near deviation is measured at 1/3 m then your F would be 3. To convert to Diopters your formula is 1/distance (in meters).


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[electiveresearch2]

If your near deviation is measured at 1/3 m then your F would be 3. To convert to Diopters your formula is 1/distance (in meters).

Thanks so much, can't believe I missed that