The relationship between halo size and intraocular light scatter in normal healthy subjects

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To determine the relationship between the size of a halo in the visual field induced by bright light and the intraocular light scatter in normal healthy eyes.


Measurements were made in the right eyes of 66 healthy subjects (mean age 33 ± 9 years). Using the Vision monitor, optotypes of low luminance (1 cd/m2) were presented at a distance of 2.5 m. The visual angle subtended by the radius of the halo was calculated in minutes of arc (arc min). Retinal straylight was measured with the compensation comparison technique. Best-corrected distance visual acuity (BCVA) was evaluated with logMAR Bailey-Lovie letter charts.


The mean radius of the halo was 199.3 ± 45.6 arc min, mean retinal straylight was 0.98 ± 0.13 log units and mean BCVA was -0.02 ± 0.07 logMAR. There was a significant positive correlation between halo radius and straylight (r = 0.32, p < 0.01) and between halo radius and BCVA (r = 0.36, p < 0.01). However, no significant relationship was found between retinal straylight and BCVA.


Higher intraocular light scatter levels were related to larger halo size in healthy human eyes.

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