Status:
UNKNOWN
Home Vision Therapy and Prism Prescription in Presbyopic Persons With Convergence Insufficiency
Lead Sponsor:
Shahid Beheshti University of Medical Sciences
Conditions:
Convergence Insufficiency
Eligibility:
All Genders
40-60 years
Phase:
NA
Brief Summary
convergence insufficiency is one of the most common binocular vision problems in which the eyes tend to have more exophoria in near than distance activities. Its prevalence is typically reported from ...
Detailed Description
Between non-strabismic binocular vision problems, convergence insufficiency is the most common problem (6) even in people with presbyopia this problem has high prevalence. (11) The most common ocular ...
Eligibility Criteria
Inclusion
- 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
- 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
Key Trial Info
Start Date :
April 3 2022
Trial Type :
INTERVENTIONAL
Allocation :
ESTIMATED
End Date :
August 1 2023
Estimated Enrollment :
250 Patients enrolled
Trial Details
Trial ID
NCT05311917
Start Date
April 3 2022
End Date
August 1 2023
Last Update
April 25 2023
Active Locations (1)
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1
Shahid Beheshti University of Medical Sciences
Tehran, Iran