Suppression associated with esotropia with convergence excess (high AC/A ratio).

Area of Science:

• Ophthalmology
• Neuroscience
• Vision Science

Background:

• Esotropia with convergence excess is a common strabismus characterized by inward turning of the eyes.
• Understanding the nuances of binocular vision in such patients is crucial for effective management.

Purpose of the Study:

• To investigate the presence and characteristics of suppression and fusion in patients with esotropia and convergence excess.
• To determine the effect of base-out prisms on binocular vision responses in this patient group.

Main Methods:

• Binocular perimetry was employed to assess visual function during near and distance tasks.
• Base-out prisms were utilized to evaluate the potential for inducing diplopia.

Main Results:

• Binocular perimetry revealed suppression during near vision tasks in patients with esotropia and convergence excess.
• Conversely, fusion capabilities were maintained for distance viewing.
• Application of base-out prisms resulted in elicited diplopia, suggesting a breakdown of binocular integration.

Conclusions:

• Patients with esotropia and convergence excess demonstrate a specific pattern of binocular vision impairment, with near suppression and distance fusion.
• The induction of diplopia by base-out prisms highlights the delicate balance of fusional mechanisms in this condition.