AIM: To analyze the clinical effect of posterior chamber implantable contact lens(ICL)implantation on extreme high myopia.

METHODS: ICL or Toric ICL(TICL)implantation was performed in 40 eyes of 20 patients with extreme high myopia. Spherical refraction of these patients was -10.0--18.0D and cylinder refraction was -0.25--3.00D. All the patients' equivalent spherical refraction was -15.32D. Uncorrected visual acuity(UCVA), best-corrected visual acuity(BCVA)slit-lamp examination, intraocular pressure(IOP), topography examination, amount of corneal endothelial cells was examined in these patients and follow-up was 12 months.

RESULTS:Twelve months after surgery, 32 eyes(80.0%)received UCVA better than 0.8. One line increased in eye chart of BCVA was 12 eyes(30.0%)and two lines were 6 eyes(15.0%)postoperatively. Refraction between +0.5D and -0.5D was 28 eyes(70.0%)after surgery. There was no significant difference of IOP between preoperation and postoperation(t=0.518, P=0.776). There was no significant difference of average amount of corneal endothelial cells before surgery(2 823±243.6/mm²)and 6 months after surgery(2 709±273.2/mm²). No other complications occurred during and after surgery.

CONCLUSION: For extreme high myopia, ICL implantation is safe and effective.