A study on abnomality of anatomic structures of primary acute angle closure glaucoma

Abstract

Objective To explore the differences in anatomic structures of primary acute angle closure glaucoma (PAACG).Methods sixty eyes of 30 cases of PAACG and 60 eyes of 30 cases of normal eyes were enrolled in the study.For PAACG patients,anatomical structural data were obtained before and after trabeculectomy surgery.Then the results were compared with the data of normal eyes.Observational items included anterior chamber depth,lens thickness,vitreous cavity length,axial length and corneal diameter.The relative location of lens was calculated by the formula (anterior chamber depth + 1/2 lens thickness) over axial length.The coefficient of lens thickness over axial length was calculated and analyzed.Results Compared with normal eyes,PAACG patients had shallower anterior chamber,thicker lens,shorter axial length,forward shifting of lens position,smaller corneal diameter and larger coefficient of lens thickness/axial length.The differences were statistically significant (P ＜ 0.05).Conclusion PAACG patients have shallower anterior Chamber,thicker lens,shorter axial length and smaller corneal diameter.The relative location of lens and coefficient of lens thickness/axial length are the early indicators for PAACG. Key words: Glaucoma, angle closure, acute; Structure, anatomic ; Ultrasonography; Trabeculectomy