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Comparison of early changes in and factors affecting vault following posterior chamber phakic Implantable Collamer Lens implantation without and with a central hole (ICL V4 and ICL V4c)

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ABSTRACT

Background: To objectively compare the early changes in vault over time following implantation of an Implantable Collamer Lens without (ICL V4) and with (ICL V4c) a central hole and the respective factors affecting vault change in moderate to high myopia.

Methods: This prospective study comprised of 38 eyes of 38 patients implanted with ICL V4 and 39 eyes of 39 patients implanted with ICL V4c intraocular lenses. We quantitatively assessed the postoperative values of vault and pupil size at 1 day, 1 week, and 1 month following implantation using a rotating Scheimpflug camera (Pentacam). We compared these postoperative values within and between the two groups and identified the factors affecting vault change.

Results: The mean vaults at 1 day, 1 week, and 1 month following ICL V4 implantation were 303.68 ± 185.11, 517.89 ± 160.07 and 521.32 ± 155.72 μm respectively, and those following ICL V4c were 316.67 ± 186.89, 495.13 ± 180.84 and 510.77 ± 175.51 μm, respectively. There was a significant difference in vault between 1 day and 1 week postoperatively. There was a significant association between the vault change and the pupil size change in both groups from 1 day to 1 month postoperatively (Pearman correlation coefficient; ICL V4: r = 0.585, P = 0.001; ICL V4c: r = 0.588, P <0.001). The vault value 1 month after implantation of ICL V4 and ICL V4c was associated with the preoperative anterior chamber depth, horizontal corneal diameter, horizontal and vertical sulcus-to-sulcus.

Conclusions: Pupil movement is a critical factor in vault change, with increasing vault observed postoperatively from 1 day to 1 week associated with the declining effects of pharmacological miosis and increasing pupil size. The anterior chamber depth, horizontal corneal diameter, horizontal and vertical sulcus-to-sulcus show some correlation with vault.

Electronic supplementary material: The online version of this article (doi:10.1186/s12886-016-0336-8) contains supplementary material, which is available to authorized users.

No MeSH data available.


Correlation between anterior chamber depth and the central vault in the ICL V4 and ICL V4c groups (r = 0.562, P <0.001; r = 0.524, P = 0.001, respectively)
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Fig4: Correlation between anterior chamber depth and the central vault in the ICL V4 and ICL V4c groups (r = 0.562, P <0.001; r = 0.524, P = 0.001, respectively)

Mentions: The results of multiple regression analyses are shown in Table 3. The independent variable relevant to the vault in the two group was ACD (R2 = 0.357, P <0.001; R2 = 0.316, P = 0.001, respectively). The multiple regression equation was expressed as follows: ICL V4 Central vault (μm) = (386.51 * ACD) - 718.77, ICL V4c Central vault (μm) = (503.43 * ACD) - 1075.64, respectively. The standardized partial regression coefficient was calculated to determine the magnitude of each variable’s influence. Apart from ACD, the WTW, horizontal and vertical STS were also relevant variables to the vault in the two groups. The central vault was positively correlated with WTW of the two groups (Pearman correlation coefficient; ICL V4: r = 0.440, P = 0.006; ICL V4c: r = 0.366, P = 0.022, respectively), horizontal STS (ICL V4: r = 0.355, P = 0.029; ICL V4c: r =0.365, P = 0.022, respectively), and vertical STS (ICL V4: r = 0.345, P = 0.034; ICL V4: r = 0.344, P = 0.032, respectively). The relationships between vault and ACD, WTW, horizontal and vertical STS are shown in Figs. 4, 5, 6 and 7, respectively. There was no significant correlation shown with any other factors.Table 3


Comparison of early changes in and factors affecting vault following posterior chamber phakic Implantable Collamer Lens implantation without and with a central hole (ICL V4 and ICL V4c)
Correlation between anterior chamber depth and the central vault in the ICL V4 and ICL V4c groups (r = 0.562, P <0.001; r = 0.524, P = 0.001, respectively)
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Related In: Results  -  Collection

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Fig4: Correlation between anterior chamber depth and the central vault in the ICL V4 and ICL V4c groups (r = 0.562, P <0.001; r = 0.524, P = 0.001, respectively)
Mentions: The results of multiple regression analyses are shown in Table 3. The independent variable relevant to the vault in the two group was ACD (R2 = 0.357, P <0.001; R2 = 0.316, P = 0.001, respectively). The multiple regression equation was expressed as follows: ICL V4 Central vault (μm) = (386.51 * ACD) - 718.77, ICL V4c Central vault (μm) = (503.43 * ACD) - 1075.64, respectively. The standardized partial regression coefficient was calculated to determine the magnitude of each variable’s influence. Apart from ACD, the WTW, horizontal and vertical STS were also relevant variables to the vault in the two groups. The central vault was positively correlated with WTW of the two groups (Pearman correlation coefficient; ICL V4: r = 0.440, P = 0.006; ICL V4c: r = 0.366, P = 0.022, respectively), horizontal STS (ICL V4: r = 0.355, P = 0.029; ICL V4c: r =0.365, P = 0.022, respectively), and vertical STS (ICL V4: r = 0.345, P = 0.034; ICL V4: r = 0.344, P = 0.032, respectively). The relationships between vault and ACD, WTW, horizontal and vertical STS are shown in Figs. 4, 5, 6 and 7, respectively. There was no significant correlation shown with any other factors.Table 3

View Article: PubMed Central - PubMed

ABSTRACT

Background: To objectively compare the early changes in vault over time following implantation of an Implantable Collamer Lens without (ICL V4) and with (ICL V4c) a central hole and the respective factors affecting vault change in moderate to high myopia.

Methods: This prospective study comprised of 38 eyes of 38 patients implanted with ICL V4 and 39 eyes of 39 patients implanted with ICL V4c intraocular lenses. We quantitatively assessed the postoperative values of vault and pupil size at 1&nbsp;day, 1&nbsp;week, and 1&nbsp;month following implantation using a rotating Scheimpflug camera (Pentacam). We compared these postoperative values within and between the two groups and identified the factors affecting vault change.

Results: The mean vaults at 1&nbsp;day, 1&nbsp;week, and 1&nbsp;month following ICL V4 implantation were 303.68&thinsp;&plusmn;&thinsp;185.11, 517.89&thinsp;&plusmn;&thinsp;160.07 and 521.32&thinsp;&plusmn;&thinsp;155.72&nbsp;&mu;m respectively, and those following ICL V4c were 316.67&thinsp;&plusmn;&thinsp;186.89, 495.13&thinsp;&plusmn;&thinsp;180.84 and 510.77&thinsp;&plusmn;&thinsp;175.51&nbsp;&mu;m, respectively. There was a significant difference in vault between 1&nbsp;day and 1&nbsp;week postoperatively. There was a significant association between the vault change and the pupil size change in both groups from 1&nbsp;day to 1&nbsp;month postoperatively (Pearman correlation coefficient; ICL V4: r&thinsp;=&thinsp;0.585, P&thinsp;=&thinsp;0.001; ICL V4c: r&thinsp;=&thinsp;0.588, P &lt;0.001). The vault value 1&nbsp;month after implantation of ICL V4 and ICL V4c was associated with the preoperative anterior chamber depth, horizontal corneal diameter, horizontal and vertical sulcus-to-sulcus.

Conclusions: Pupil movement is a critical factor in vault change, with increasing vault observed postoperatively from 1&nbsp;day to 1&nbsp;week associated with the declining effects of pharmacological miosis and increasing pupil size. The anterior chamber depth, horizontal corneal diameter, horizontal and vertical sulcus-to-sulcus show some correlation with vault.

Electronic supplementary material: The online version of this article (doi:10.1186/s12886-016-0336-8) contains supplementary material, which is available to authorized users.

No MeSH data available.