Repeatability of lens densitometry using Scheimpflug imaging

Abstract

Lens densitometry using Scheimpflug imaging was highly repeatable. However, repeatability was dependent on the analysis mode used. Repeatability decreased with increasing opacification.

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

“…This is a problem inherent in this technology that could lead to higher and false maximum values. 10 Careful analysis of previously published studies also showed the same limitation. In the present study, we used the automatic densitometry method.…”

“…There is no consensus regarding which method and variable are the most representative of the true optical status of the lens nucleus. 10 In a previous study, 17 the maximum value assessed at a single point was found to be most likely representative of the nucleus because the nuclear cataract is regarded as a homogenous structure. Another issue is the presence of reflex artifacts in front or within the lens.…”

“…6,7,9 Scheimpflug imaging enables objective lens densitometry evaluation that is not susceptible to observer variability and is considered to be a more sensitive and repeatable approach. 8,10 Wavefront analysis objectively evaluates the visual deterioration by quantifying the HOAs of the ocular optical system. In our study, we used a ray-tracing aberrometer (iTrace) that has known advantages over Hartmann-Shack and other types of wavefront sensors.…”

“…Because this is the main region with scattering changes in a large percentage of cases, this finding influences the real assessment of the nucleus optical density. 10,17 Customization of the cylindrical template might help overcome this limitation. Improvements in the Scheimpflug camera would be useful for a more detailed and specific assessment of the nucleus.…”

“…[6][7][8][9] Various methods for the measurement of lens optical densitometry have been used; however, there is still no consensus regarding this topic. 10 Other diagnostic devices, such as wavefront analyzers, can objectively assess higher-order aberrations (HOAs) of the optical system. 2,11,12 This technology also has shown to be useful for the evaluation of patients with different grades of cataract because HOAs play an essential role in the reduction in optical performance in these patients.…”