FEATURES


Fusional Vergence

What is Fusional Vergence?


Fusional Vergence is the movement of both eyes that enables the fusion of monocular images producing binocular vision. It is used clinically to check the ability of convergence and divergence. Convergence is the disjugate movement in which both eyes rotate inwards for bifoveal single vision. It does not deteriorate with age like accommodation but can be affected in visually demanding situations. Fusional convergence is a reflex produced to ensure that similar retinal images are projected onto corresponding retinal areas. Near Point of Convergence (NPC) is the closest point at which an object can be seen as single during bifoveal vision. Divergence is the disjugate movement in which both eyes rotate outwards for bifoveal single vision.


Vergence Dysfunction (Duane):

  • Convergence Insufficiency (CI) is the inability to maintain the two eyes together while working at a near distance. It is a sensory and neuromuscular anomaly of the binocular visual system. “Classic” convergence insufficiency (CI) consists of a receded near point of convergence (NPC), exophoria at near, reduced positive fusional convergence (PFC), and deficiencies in negative relative accommodation (NRA).
  • Divergence Excess (DE) can be described clinically as exophoria or exotropia at far greater than the near deviation by at least 10 prism diopters (PD).
  • Basic Exophoria: Same amount of Exo deviation for distance and near.
  • Convergence Excess (CE) is a condition where there is more Eso-deviation for near (3 PD). CE is indicated by a high accommodative convergence/accommodation (AC/A) ratio.
  • Divergence Insufficiency (DI), Esophoria more for distance than near. Symptomatic patients usually have low fusional divergence amplitudes at distance and low AC/A ratios.
  • Basic Esophoria Same amount of Eso Deviation for distance and near and a normal AC/A ratio.
  • Fusional Vergence Dysfunction (vergence insufficiency) is characterized by orthophoria (or phoria within normal range) and a normal AC/A ratio but reduced fusional vergence amplitudes. Such patients have a small range of Binocular single vision.

Know How….



Contact us


Call us

+91 7498 75 1001


Send us an email

info@bynocs.com



Subscribe


Sign up for Medicare newsletter to receive all the news offers and discounts from Medicare eye clinic.




Social networks






Contact us


Call us

+91 7498 75 1001


Send us an email

info@bynocs.com



Subscribe


Sign up for Bynocs newsletter to receive all the news offers and discounts from Bynocs.




Social networks


Facebook

https://www.facebook.com/bynocseye/


YouTube

https://www.youtube.com/Bynocs


LinkedIn

https://www.linkedin.com/company/bynocs/about/