Classification of regulatory common internal strabismus

  Patients with accommodative internal strabismus are classified according to the standard state of eye position in the corrected state with lenses. However, there are types that may not have significant refractive error, as may be the case with both the hyperopic and the underdistracted types.  The majority of patients with adequate ciliary muscle paralysis, who are prescribed a sufficient amount of corrective spectacles for hyperopia and are reviewed after 3-4 weeks of wear, may be classified as one of the following types: 1. Fully adjusted: This type has normal binocular vision and normal binocular vision after wearing refractive correction spectacles, but strabismus appears again after removal of the spectacles. In the early stage when the strabismus position is completely corrected by wearing glasses, binocular vision may be diminished because the patient cannot retard the adjustment power immediately.  2. Convergence overpowering type: There is binocular monopia at a distance, and at a close distance, the internal strabismus position is presented, and sometimes wearing glasses is also ineffective. There are also patients who are normally orthophoric and show internal strabismus when attempting to gaze at objects at close distances. In order not to have a strabismus at near distance (with large lenses), it is difficult to see clearly at distance, so bifocals are necessary. Although this type of internal strabismus is sometimes related to hyperopia, some are completely free of refractive error.  3. Insufficient separation type: look at the distance for the internal strabismus, look at the near for the internal oblique. It is mostly associated with congenital myopia, which can only see objects at close distances. It is also seen in the treatment of convergence hyperopia with pupil reduction agents, which causes a small amount of internal strabismus due to the spasm of accommodation that makes it difficult to separate the distant vision.  4. Partial adjustment type: Both eyes have an internal strabismus, and the correction of refraction only reduces the strabismus, which is often a paralytic strabismus with an adjustment factor. There are also some patients who have completely regulated internal strabismus, but due to insufficient treatment, they cannot recover the orthotropic position even after refractive correction. There is a wide variety of visual function in both eyes of patients with this condition. Some have a good foundation, while others are very poor. Some even lose binocular vision completely.