Home Vision Therapy and Prism Prescription in Presbyopic Persons With Convergence Insufficiency
Convergence Insufficiency
About this trial
This is an interventional treatment trial for Convergence Insufficiency focused on measuring vision therapy, prism prescription, convergence insufficiency
Eligibility Criteria
Inclusion Criteria:
CISS score more than the estimated cut off point
Best corrected visual acuity=20/20 for near and far
Having Convergence Insufficiency
Near exophoria should be at least 4 prisms more than distant exophoria
NPC more than 6 cm
Inadequate near-positive positive fusion according to the Convergence Insufficiency Treatment Trial (CITT) study (8)
Normal monocular accomodation amplitude according to Hofster formula
Exclusion Criteria:
Any type of strabismus
Amblyopia
Refractive error more than 6 diopters
Patients with history of prism prescription
History of vision therapy from 5 years ago
History of strabismus surgery or refractive error surgery
History of eye trauma
Use of any ophthalmic or general ophthalmic drugs affect ocular accommodation such as phenylephrine, anticholinergic drugs (mydriatics), carbonic anhydrase inhibitors, antihistamines, morphine and its derivatives, antidepressants amphetamine and imipramine
More than one prism of vertical phoria
Any mechanical limitations in the eye muscles
Ocular muscle paralysis
Nystagmus
Any systemic and neurological diseases affecting binocular vision such as diabetes, myasthenia gravis, Graves', multiple sclerosis
Sites / Locations
- Shahid Beheshti University of Medical SciencesRecruiting
Arms of the Study
Arm 1
Arm 2
Arm 3
Experimental
Experimental
Placebo Comparator
home vision therapy
base in prism prescription
conventional
near glasses will be prescribed along with a complete training of the exercises and with a eye exercise form of information about how and how long to do the exercise, by optometrist No 2 (Saeid Abdi).training includes: Voluntary convergence, Bug on string, Eccentric Circles, Jumping vergence , Barrel card, chiastopic fusion, Brock string, push-up These exercises will be done 3 days a week for 20 minutes ( 10 minutes at noon and 10 minutes at night ) for 2 month. Home exercises include eight vision therapy exercises and patients will do two exercises each day at noon and two exercises at night.
base in prism prescription using sheards criterion near prismatic glasses will be prescribed and the amount of prism will be divided between two eyes; and random and aimless eye movements, without convergence and accommodation effects will be prescribed by optometrist No. 2 (Saeid Abdi). patients should complete their checking form for eye exercises.
new near glasses as a conventional treatment with the practice of random and aimless eye movements, without convergence and accommodation effects will be prescribed by optometrist No. 2 (Saeid Abdi). patients should complete the form of their eye training.