Reduction of pupil size and halos with minus lenses after laser in situ keratomileusis.
OBJECTIVE
To evaluate the amount of miosis induced by over-minused lenses and to assess subjective reduction of halos following laser in situ keratomileusis (LASIK) with such lenses.


METHODS
Part I: Infrared pupil diameter was assessed in 14 patients who had not had ocular surgery. The accommodative/miotic reflex was stimulated with concave trial lenses in -1.00-D increments up to -4.00 D while viewing the 20/40 acuity line. Part II. Subjective halos around a distant light were assessed in 14 patients following LASIK for myopia, with and without a -1.00-D lens over manifest refraction.


RESULTS
Part I: 100%, 79%, and 64% of patients clearly saw the 20/40 line with a -1.00-D lens, -2.00-D lens, and -3.00/-4.00-D lens, respectively. Mean pupil diameter decreased by 0.2 mm with the -1.00-D lens (P = .02), 0.5 mm with the -2.00-D lens (P = .003), 0.9 mm with the -3.00-D lens (P = .008,), and 1.1 mm with the -4.00-D lens (P = .008). Part II: 11 of 14 patients (79%) noticed a decrease in the size of the halo (30% average reduction) when over-minused by -1.00 D.


CONCLUSIONS
Pupil diameters and halos decreased with a -1.00-D overcorrection in patients following LASIK. Patients with pupil-dependent night halos after LASIK may benefit from mildly over-minused lenses.
Wachler
Brian S Boxer
BS
Boxer Wachler Vision Institute, 465 N. Roxbury Drive, Suite 902, Beverly Hills, CA 90210, USA. bbw@boxerwachler.com
Hiatt
Drew
D
Chou
Brian
B
Christie
Jonathan P
JP
D000065:Accommodation, Ocular / Q000502:physiology; D000328:Adult; D003315:Cornea / Q000601:surgery*; D005139:Eyeglasses; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D011183:Postoperative Complications / Q000628:therapy*; D011680:Pupil / Q000502:physiology*; D012029:Refraction, Ocular / Q000502:physiology; D015348:Vision, Binocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology