OBJECTIVE: This study aims to investigate the changes of anterior segment parameters after prophylactic laser peripheral iridotomy (LPI) using Pentacam.
MATERIAL AND METHODS: 25 primary angle closure suspect (PACS) eyes (group I) and 25 primary angle closure (PAC) eyes and unaffected fellow ones of acute angle closure (AAC) (group II) were evaluated with Pentacam before and 1 week after neodymium: yttrium: aluminum garnet (Nd: YAG) LPI. We measured the anterior chamber angle (ACA), central anterior chamber depth (CACD), peripheral anterior chamber depth (PACD), anterior chamber volume (ACV), K readings (K1 and K2), central corneal thickness (CCT) and pupil diameter (PD). Paired t-test was used to investigate the differences in anterior segment parameters before and after LPI.
RESULTS: 25 primary angle closure suspect (PACS) eyes in (group I) and 25 primary angle closure (PAC) eyes with unaffected fellow ones of acute angle closure (AAC) in (group II) of 35 patients (18 men and 17 women) were included in the study. All subjects were Egyptians. Mean age of patients was 59.4 years old (range 51-70). Mean spherical equivalent was 1.84 ± 0.58 diopters (range 1 – 3.5). There was no statistically difference between these groups either in age or in refraction (P > 0.05).
In group I , statistically significant differences were found before and 1 week after LPI in mean ACA, PACD, ACV (all P < 0.05) and statistically insignificant differences were found in mean CACD (P = 0.10), PD (P = 0.785), CCT (P = 0.685) and K readings (P = 0.407). After LPI, We found ACV statistically increased from 83.88±4.2 mm3 to 98.36±7.7 mm3 (P = 0.000), and also superior, inferior, nasal and temporal PACD statistically increased from 0.97 mm, 1.14 mm, 0.97 mm, 1.29 mm to 1.10 mm, 1.26 mm, 1.11 mm and 1.41 mm respectively (all P = 0.000) and ACA statistically increased from 23.3±2.9 degrees to 25.45±2.8 degrees (P = 0.000).
In group II , statistically significant differences were found before and 1 week after LPI in ACA, PACD, ACV (all P < 0.05) and statistically insignificant differences were found in CACD (P = 0.108), PD (P = 0.281), CCT (P = 0.604) and K readings (P = 0.344). After LPI, We found ACV statistically increased from 69.8±10.7 mm3 to 80.72±14.2 mm3 (P = 0.000), and also superior, inferior, nasal and temporal PACD statistically increased from 0.98 mm, 1.12 mm, 0.87 mm, 1.2 mm to 1.12 mm, 1.21 mm, .96 mm and 1.33 mm respectively (all P = 0.000) and ACA statistically increased from 24.1±2.7 degrees to 25.8±2.8 degrees (P = 0.000).
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