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- Prism_fusion_range abstract "The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision (BSV) in the presence of increasing vergence demands. Motor fusion is largely accounted to amplitudes of fusional vergences and relative fusional vergences. Fusional vergence is the maximum vergence movement enabling BSV and the limit is at the point of diplopia (double vision). Relative fusional vergence is the maximum vergence movement enabling a patient to see a comfortable clear image and the limit is represented by the first point of blur. These motor fusion functions should fall within average values so that BSV can be comfortably achieved. Excessive stress on the vergence system or inability to converge or diverge adequately can lead to asthenopic symptoms, which generally result from decompensation of latent deviations (heterophoria) or loss of control of ocular misalignments. Motor anomalies can be managed in various ways, however, in order to commence treatment, motor fusion testing such as the PFR is required. The PFR involves placing a prism bar in front of an eye. In a patient with BSV, a natural shift of the eye occurs. When measuring horizontal fusion ranges, base in prisms assess fusional divergence while base out prisms assess fusional convergence. The vertical fusional vergence amplitude can also be measured with base up and base down prisms although the horizontal PFR is typically the main focus when testing. When performing the PFR, prism strengths are increased, placing greater demand on the vergence system, eventually resulting in a break point accompanying diplopia. Break point, recovery and blur are key aspects of this assessment. The break point occurs at the loss of BSV, recovery point when BSV is regained from break and blur point is at the loss of comfortable BSV. These stops can be subjectively indicated when the patient notices a double or blurred image. Both subjective and objective measurements can be considered however the examiner’s objective observation is the gold standard.".
- Prism_fusion_range thumbnail Prism_bar_and_fixation_stick.jpg?width=300.
- Prism_fusion_range wikiPageID "47676832".
- Prism_fusion_range wikiPageLength "11095".
- Prism_fusion_range wikiPageOutDegree "47".
- Prism_fusion_range wikiPageRevisionID "683466075".
- Prism_fusion_range wikiPageWikiLink 4_PRT.
- Prism_fusion_range wikiPageWikiLink Accommodation_(eye).
- Prism_fusion_range wikiPageWikiLink Asthenopia.
- Prism_fusion_range wikiPageWikiLink Binocular_vision.
- Prism_fusion_range wikiPageWikiLink Category:Ophthalmology.
- Prism_fusion_range wikiPageWikiLink Convergence_insufficiency.
- Prism_fusion_range wikiPageWikiLink Cyclotropia.
- Prism_fusion_range wikiPageWikiLink Diplopia.
- Prism_fusion_range wikiPageWikiLink Heterophoria.
- Prism_fusion_range wikiPageWikiLink Ophthalmology.
- Prism_fusion_range wikiPageWikiLink Orthoptics.
- Prism_fusion_range wikiPageWikiLink Prism.
- Prism_fusion_range wikiPageWikiLink Retinal_correspondence.
- Prism_fusion_range wikiPageWikiLink Snellen_chart.
- Prism_fusion_range wikiPageWikiLink Strabismus.
- Prism_fusion_range wikiPageWikiLink Suppression_(eye).
- Prism_fusion_range wikiPageWikiLink Vergence.
- Prism_fusion_range wikiPageWikiLink File:Prism_bar_and_fixation_stick.jpg.
- Prism_fusion_range wikiPageWikiLinkText "Prism fusion range".
- Prism_fusion_range wikiPageUsesTemplate Template:Orphan.
- Prism_fusion_range wikiPageUsesTemplate Template:Reflist.
- Prism_fusion_range subject Category:Ophthalmology.
- Prism_fusion_range hypernym Test.
- Prism_fusion_range type Cricketer.
- Prism_fusion_range comment "The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision (BSV) in the presence of increasing vergence demands. Motor fusion is largely accounted to amplitudes of fusional vergences and relative fusional vergences.".
- Prism_fusion_range label "Prism fusion range".
- Prism_fusion_range wasDerivedFrom Prism_fusion_range?oldid=683466075.
- Prism_fusion_range depiction Prism_bar_and_fixation_stick.jpg.
- Prism_fusion_range isPrimaryTopicOf Prism_fusion_range.