J.ophthalmol.(Ukraine).2022;2:48-53.
http://doi.org/10.31288/oftalmolzh202224853
Received: 03 November 2021; Published on-line: 30 April 2022
Use of prisms in ophthalmology: a review. Part 2. Use of prisms in heterophoria, nystagmus, and visual nervous system disorders
V. I. Serdiuchenko
SI "The Filatov Institute of Eye Diseases and Tissue Therapy of the NAMS of Ukraine"; Odesa (Ukraine)
E-mail: virais@ukr.net
TO CITE THIS ARTICLE: Serdiuchenko VI. Use of prisms in ophthalmology: a review. Part 2. Use of prisms in heterophoria, nystagmus, and visual nervous system disorders. J.ophthalmol.(Ukraine).2022;2:48-53. http://doi.org/10.31288/oftalmolzh202224853
Prism correction can be helpful not only for patients with strabismus, but also for those with other eye conditions. In heterophoria, especially in the presence of asthenopic complaints, prisms can be used for compensation for latent strabismus and development of fusional reserves. Prisms can reduce an abnormal head posture and thus normalize the posture of a child in jerk nystagmus. Base-out prisms are prescribed to induce divergence and stimulate fusional convergence for decreasing the amplitude of nystagmus and thus improving visual acuity in patients whose nystagmus is suppressed by viewing a near target. In patients whose nystagmus is worse during near viewing, base-in prisms may help which induce divergence. Prisms can be helpful for eliminating diplopia in thyroid eye disease and are used for assessing the Accommodative Convergence to Accommodation (AC/A) ratio. They can be also helpful to shift the image from the affected fovea to the preferred retinal locus in patients with absolute central scotoma and eccentric gaze fixation and to expand visual fields in patients with hemianopia and retinitis pigmentosa. Ophthalmologists should bear in mind that the above conditions can be treated with prisms, and apply prism correction widely in their practice.
Keywords: prisms, heterophoria, nystagmus, diplopia
Conflict of Interest. The author declares that there are no conflicts of interest that could influence his or her opinion on the subject matter or materials discussed in this manuscript.
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