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The Berens vertical prism bar is an instrument used in ophthalmology and orthoptics to measure vertical eye deviations and assess binocular fusion.
Technical Specifications
Specification Description
Type Vertical prism bar
Number of prisms Typically 15 to 16, depending on the manufacturer
Powers Typically 1 to 30 Δ, depending on the model
Unit of measurement Prismatic diopter (Δ)
Orientation Upper base (BS) or lower base (BI)
Material: Optical glass or synthetic material
Use: Near and distance vision
Main Uses
- Measurement of hypertropia and hypotropia: quantification of vertical deviations.
- Detection of hyperphoria: identification of latent vertical deviations.
- Assessment of vertical vergence: measurement of vertical fusional amplitudes.
- Prism cover test: neutralization of a vertical deviation using prisms.
- Orthoptic evaluation: assessment of binocular vision disorders and vertical diplopia.
Exact powers of the 15-prism model
The model includes the following powers:
1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25, and 30 Δ.
Checked by OPHTAZON
3
Year of mfg.
-
Available
New equipment
1
Year of mfg.
2026
Available
Checked by OPHTAZON
2
Year of mfg.
-
Available
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