Simple device for quantifying the influence of halos after lasik surgery.
We present a simple device (called a halometer) to detect and quantify the phenomenon of halos after certain surgical procedures, such as refractive surgery. The task of the subject consists basically of discriminating, after dark adaptation, a small light source around a central high-luminance stimulus. The device, which is connected to a computer, provides a disturbance index to measure the effect of halos on the observer's vision. Tested with normal subjects and patients after LASIK (laser in situ keratomileusis) surgery, this apparatus proved sufficiently sensitive to quantify the halos in subjects who had undergone surgery.
Gutiérrez
Ramón
R
Universidad de Murcia, Departamento de Oftalmología, Murcia, Spain.
Jiménez
José Ramón
JR
Villa
César
C
Valverde
Juan Antonio
JA
Anera
Rosario González
RG
D003623:Dark Adaptation; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000009:adverse effects*; D009755:Night Blindness / Q000175:diagnosis* / Q000209:etiology*; D010775:Photic Stimulation / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016896:Treatment Outcome; D014787:Vision Tests / Q000295:instrumentation* / Q000379:methods