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The human axial length and choroidal thickness responses to continuous and alternating episodes of myopic and hyperopic blur

Fig 2

Schematic representation of the experimental set-up for axial length measures.

A binocular periscope system was used to allow fixation of the distant target (Maltese cross) while the Lenstar biometer measured axial length.

doi: https://doi.org/10.1371/journal.pone.0243076.g002