How is microtropia diagnosed?

Diagnosis of a microtropia was determined by the following criteria: (1) Cover test revealing only a latent deviation or no deviation, in patients with microtropia with identity, or a small manifest deviation in microtropes without identity, measuring <5°.

What is the management for microtropia?

Most microtropia cases require optometric vision therapy, which incorporates the prescription of specific treatments in order to: develop adequate fusional vergence ranges, flexibility and stability. enhance accommodative/convergence relationships. integrate binocular function with information processing.

What causes microtropia?

What causes microtropia? In most cases it is a congenital condition meaning it is present at birth. In some patients, microtropia may be present as a result of other treatment for a larger strabismus, i.e. glasses or surgery. The orthoptist can explain how this relates to you.

How common is microtropia?

It is estimated that about 1% of general population has a microstrabismus. Primary microtropia is probably due to a primary sensorial defect, which predisposes to anomalous retinal correspondence. Primary microtropia may decompensate into a larger angle.

What is the Krimsky test?

(krim’skē), a test of binocular motor alignment by which a penlight is shone at the eyes and the position of the light reflex centered with a prism, thus indicating the amount of deviation.

How do you test a prism bar cover?

Method

1. Steps: 1.
2. The examiner then holds the prism bar over the patients deviating eye, starting at a small strength prism, however, if the deviation on the cover test appeared to be large, a larger strength prism may be used to achieve results quicker.
3. With the prism present, an alternate cover test is performed.

What is the abnormal retinal correspondence?

Background: Anomalous retinal correspondence (ARC) is a neural adaptation to eye misalignment in which non-corresponding retinal points are linked in the visual cortex to provide binocular fusion.

What is a micro squint?

A microtropia is a very small (micro) squint. Typically, the eye usually turns very slightly inwards or rarely, the eye turns slightly outwards.

What is modified Krimsky test?

The test works on the principle of Herring’s law of equal innervation. A cosmetic contact lens is placed in the eye with opacity and the light reflex from the cosmetic contact lens is now used for the assessment of the amount of deviation.

Can convergence insufficiency be cured?

Patients with convergence insufficiency may be permanently cured after exercises to strengthen their convergence. Continued near work following convergence therapy tends to help maintain adequate convergence once treatment is discontinued.