Vector Analysis Of The Clinical Effect Of Ticl Correction Of Myopia With Different Degrees Of Astigmatism

To analyze the clinical effect of TICL in the correction of myopia with different degrees of astigmatism by vector analysis.

Studies have shown that astigmatism greater than 0.5D will significantly affect the visual quality .

Astigmatic phakic intraocular lens implantation(TICL) is to correct myopia and astigmatism by implanting a refractive intraocular lens in the posterior chamber of the eye.

In this paper, the vector analysis method is used to analyze the clinical effect of TICL in correcting astigmatism of different degrees.

case-control study.

A total of 127 patients with myopia and astigmatism who underwent TICL surgery in our hospital from January to June 2022 were collected. According to the preoperative astigmatism, they were divided into high astigmatism group ( 66 eyes, astigmatism ≥ 2.00D ) and low astigmatism group ( 61 eyes, astigmatism < 2.00D ). Visual acuity and refractive status were examined before surgery and 1 week, 1 month, 3 months, 6 months and 12 months after surgery. Alpins vector was used to analyze the astigmatism correction effect of the two groups at 1 year after operation.

The astigmatism within ± 0.5 D at 1 year after surgery was 70 % in the high astigmatism group and 90 % in the low astigmatism group ( P < 0.05 ).

The average cylinder decreased from − 2.89 ± 0.96D to − 0.52 ± 0.38D( high astigmatism group) and from − 1.39 ± 0.30D to − 0.32 ± 0.22D(low astigmatism group) at 1 year after operation..

The astigmatism correction index ( CI ) of the two groups at 1 year after operation was 0.96 in the high astigmatism group and 1.00 in the low astigmatism group ( P > 0.05 ). The success index ( IS ) was 0.19 in the high astigmatism group and 0.25 in the low astigmatism group ( P = 0.038 ). The flattening index ( FI ) was 0.93 in the high astigmatism group and 0.94 in the low astigmatism group ( P > 0.05 ).

TICL has the same effectiveness, predictability, safety and stability for the correction of different degrees of astigmatism. The correction success index for high astigmatism is higher than that for low astigmatism.