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Is it possible to measure pseudophakic eyes with the anterior chamber depth meter?

April 26, 2017anterior chamber depth eyes measure meter possible pseudophakic

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Is it possible to measure pseudophakic eyes with the anterior chamber depth meter?

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No! An implanted IOL does not scatter the slit beam of the slit lamp because of its polished optical surfaces. The illumination from the side causes bright reflex images (Purkinje images of the IOL). The software interprets and evaluates these wide and very bright images as the anterior IOL surface. This leads to erroneous measurements. Therefore this measuring method must not be used on pseudophakic patients. The measurement requires scattered light from the lens. The IOL of just-operated patients is hardly scattering light. That’s why measurements are not possible in this case. The ACD measurement is interesting especially in pseudophakic patients with accommodative lenses. The front and back side of IOLs are strong reflecting surfaces. It is possible to measure the position of the reflexes and therefore the relative movement of the IOL.