Objective      To compare the types of accommodation and nonstrabismic binocular anomalies before and after implantable collamer lens (ICL) implantation in the patients with high myopia.       Methods      Thirty patients with high myopia

at an age of 20-35 (28 in median)

were selected for ICL implantation in our department from September 2014 to February 2015

and they had spherical power from -10.00D to -20.00D (-16.25D in median)

and cylindrical power from 0 to -5.00D (-3.75D in median). Before ICL implantation and in the 1st

3rd

and 6th months after ICL implantation

binocular visual functions were examined under the best corrected visual acuity with the test object at the previous line

including distant lateral phoria (DLP)

near lateral phoria (NLP)

distant positive fusion vergence (DPFV)

distant negative fusion vergence (DNFV)

near positive fusion vergence (NPFV)

near negative fusion vergence (NNFV)

accommodative convergence/accommodation (AC/A)

accommodation of facility (AF)

binocular cross-cylinder (BCC)

positive relative accommodation/negative relative accommodation (NRA/PRA)

and amplitude of accommodation (AMP). The types of accommodation and nonstrabismic binocular anomalies were analyzed in different periods.       Results      Before ICL implantation

22 (73.33%) patients were free from binocular single vision. Specifically

there were 18 (60%) patients with monocular suppression and 4 (13.3%) with diplopia. After ICL implantation

there was no suppression or diplopia

and all the patients showed stable binocular single vision. Before ICL implantation

8 patients (26.67%) had accommodative dysfunctions and 22 patients (73.33%) had binocular dysfunctions. After ICL implantation

29(96.67%) patients had accommodative insufficiency

and only one (3.33%) had convergence insufficiency and accommodative insufficiency.       Conclusion      The patients with high myopia have different types and degrees of accommodation and nonstrabismic binocular anomalies. ICL can reduce the patients， myopic power and improve their binocular single vision. But it leads to accommodation deficiency

which may be associated with asthenopia symptoms after ICL implantation.