Define eccentric fixation?

Under monocular conditions the patient uses a small, discrete, non foveal area for localization and identification

Define eccentric viewing?

Under monocular conditions, the patient uses the foveal area for localization, but uses the non foveal area for identification

1.  Amblyopia is a reduction in central vision, 2.  that cannot be compensated by optical or refractive means to a certain standard acuity, 3. that is not due to any ocular or pathological abnormality seen by the optometrist

What do you call an amblyopia that improves but not completely?  Why does this happen?

Relative amblyopia;  A functional amblyopia (reversible) is superimposed upon an organic (irreversible) amblyopia

1.  Strabismic

2.  Anisometropic

3.  Visual Deprivation

     a.  Occlusion Amblyopia

     b.  Ametropic Amblyopia

     c.  Meridonal Amblyopia

1.  Organic Amblyopia

     a.  relative Amblyopia

     b.  Receptor Amblyopia

     c.  Congenital Amblyopia

2.  Amblyopia secondary to Nystagmus

What does a single letter acuity predict?

What line the amblyope should be able to see on the next visit after he improves a bit.

1. 1/2 the refractive Rx on high Rxs and
2. occlude for 2hrs every day

How do you know when the amblyope has reached a plateau in treatment?

1.  No improvement in acuity after 2 to 3 visits

2.  No prediction of improved acuity with a single letter.

How much astigmatism must be present to raise concern for meridional amblyopia?

2.50D

1)  Strabsimic (according to Ophthamologists)

2)  Anisometropic (According to Optometrists)