AIM: To discuss the function of rigid gas permeable(RGP)oncone corneal refraction.

METHODS: Forty-six patients 73 eyes were diagnosed with early conical cornea. In statistical analyses, the vision correction of patients with spectacles framework are compared to that of other patients with RGP.

RESULTS: Vision correctionof patients with RGP is statistically different from that of patients who wear framework glasses(P<0.05). The difference values between the patients' two-times of optometry examination results on the condition of wearing RGP were statistically different from the difference values of examination results on condition that patients wear no glasses(P<0.05). In the condition of wearing RGP, vision correction among male patients was statistically better than that among female patients(P<0.05). Vision correction of the patients below 25 was not statistically different from that of the patients above 25(P>0.05). The patients' cornea were 490μm thick, which was statistically different from normal corneal thickness(P<0.05).

CONCLUSION: Corrected visual acuity of patients wearing RGP is better than that of patients with framework glasses. The optometry examination result of patients with RGP is more accurate. Corrected visual acuity of men is better than that of women, on the condition of wearing RGP. Vision correction extent has no difference among patients of different ages, when they wear RGP. The cornea of cone corneal patients is commonly thinner than that of normal persons.