Evaluation of the anterior chamber angle in keratoconus and normal subjects

- Anterior chamber angle in keratoconus was compared to an age-matched normal cohort.
- In each group there was no statistical difference between nasal and temporal angles.
- Nasal and temporal angles showed no statistical difference between the two groups.
- Visante OCT tended to estimate the angle as narrower than the Orbscan II.
- It is concluded that in keratoconus the anterior chamber angle is unchanged.

PurposeTo evaluate the anterior chamber angle in keratoconus eyes by use of the Visante™ OCT and Orbscan™ II.MethodsAnterior chamber angle was measured with the Visante™ OCT and Orbscan™ II in 52 subjects, 26 KC subjects and 26 age and control subjects.ResultsWhen comparing the nasal and temporal angles obtained with the two techniques no correlation was found (R2 always below 0.01) in either the control subjects or in the KC subjects. Despite this, there was an overall statistically significant difference in mean anterior chamber angles (p < 0.001) between Visante™ OCT and Orbscan™ II. There was no statistical difference (p > 0.05) between nasal and temporal anterior chamber angles when comparing controls and KC subjects with either of the two instruments. In general, the Visante™ OCT gave a smaller estimate of the anterior chamber angle.ConclusionThe values from the Visante™ OCT and Orbscan™ II cannot be interchanged since the difference in measurement of the anterior chamber angle was significantly different between the two instruments.