J Korean Ophthalmol Soc.  2020 Jan;61(1):17-26. 10.3341/jkos.2020.61.1.17.

Anterior Chamber and Lens Position before and after Phacoemulsification According to Axial Length

• Jung SH
• Kim S
• Chung SH

• KMID: 2468472
• DOI: http://doi.org/10.3341/jkos.2020.61.1.17

Abstract

PURPOSE
In this study, we evaluated changes in the anterior chamber structure and lens position before and after phacoemulsification in eyes grouped by axial length (AL).
METHODS
This study included 65 eyes (16 short eyes [AL < 22.5 mm], 33 normal eyes [22.5 mm < AL < 25.0 mm], and 16 long eyes [AL > 25.5 mm]) that underwent cataract surgery. Pre- and postoperative anterior chamber depth (ACD) was measured using Pentacam® and IOL Master®,. In addition, we evaluated the anterior chamber angle (ACA), anterior chamber volume (ACV), epithelium-iris distance, and iris-lens (intraocular lens [IOL]) distance.
RESULTS
The change in ACD was significantly smaller in long eyes (Pentacam®,, p = 0.000; IOL Master®,, p = 0.001). The change in ACA was significantly larger in short eyes (p = 0.000), and the change in ACV was significantly smaller in long eyes (p = 0.000). The change in the epithelium-iris distance was significantly smaller in long eyes (p = 0.000), and the change in the iris-lens (IOL) distance was significantly smaller in short eyes (p = 0.000).
CONCLUSIONS
In short eyes, changes in ACD, ACA, and ACV were found to be larger than those of other groups as the iris moved backward. In long eyes, greater backward movement of the IOL was observed. Therefore, the appropriate IOL power should be chosen, considering the postoperative position of the IOL during cataract surgery of short and long eyes.

Keyword

Anterior chamber depth; Axial length; Intraocular lens; Long; Short

MeSH Terms

Anterior Chamber*
Cataract
Iris
Lenses, Intraocular
Phacoemulsification*

Figure

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  Figure 1 Parameters measured with the Scheimpflug images of Pentacam®,. (A) Anterior chamber depth (red line), distance from the anterior surface of the iris to the anterior surface of the crystalline lens (yellow line). (B) Distance from the anterior surface of the iris to the anterior surface of the intraocular lens (green line).

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  Figure 2 Associations between axial length and difference of anterior chamber parameters (ACD-Pentacam®, [A], ACD-IOL Master®, [B], ACA [C], ACV [D], Epithelium-Iris distance [E] and iris-lens [IOL] distance [F]). ACD = anterior chamber depth; ACA = anterior chamber angle; ACV = anterior chamber volume; IOL = intraocular lens. Statistically significant p-value <0.01 using Pearson's correlation analysis.

• 

  Figure 3 Changes in anteror segment before and after phacoemulsification in a short and a long eye, measured with Scheimpflug images of Pentacam®,. Change in anteror segment of a short eye (axial length [AL] 21.23), before phacoemulsification (A) and after phacoemulsificaion (B), change in anteror segment of a long eye (AL 27.34) before phacoemulsification (C) and after phacoemulsificaion (D).

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