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References in periodicals archive ?
DELTA] = prism diopter, CISS = Convergence Insufficiency Symptom Survey, exo = exophoria, NFV = negative fusional vergence, NPC = near point of convergence, PFV = positive fusional vergence, VSAT = Visual Search and Attention Test.
50 165 6/5 DV CT 3[DELTA] exophoria NV CT 3[DELTA] exophoria @ 40cm Near point of convergence 18cm Intermittent diplopia and frontal HA when studying
Although a decompensated exophoria at near and a convergence insufficiency commonly occur together, they are not the same thing.
Practitioner may consider a base-out prism for an esophoria which doesn't respond to refractive correction, or base-in prism for older patients with exophoria at near.
The cases that are amenable to optometric management are those where there is a long-standing exophoria that may be decompensating into an exotropia, perhaps owing to an increase in near visual tasks at school.
This is why, on average, the normal heterophoria is a small degree of esophoria for distance vision and exophoria for near vision (Figure 1).
Another child with moderate or high levels of hyperopia may demonstrate excellent accommodation, near and distance VAs, have an exophoria and be excelling in reading, writing, visuo-perceptual skills etc--that child may not need spectacle correction at all--partial or full.
Patients who have excessive myopia can also have strabismus, typically an exophoria or exotropia, and they are more likely to develop early cataracts.
Cover test on this child, at near, with these spectacles on revealed a 10[DELTA] exophoria with slow recovery.