Ocular dominance and patient satisfaction after monovision induced by intraocular lens implantation.
OBJECTIVE
To elucidate the relationship between ocular dominance and patient satisfaction with monovision induced by intraocular lens implantation.


METHODS
Eye Clinic, Kitasato University School of Medicine Hospital, Sagamihara, Kanagawa, Japan.


METHODS
The durations of exclusive visibility of dominant- and nondominant-eye targets were measured in 16 patients with successful monovision and 4 patients with unsuccessful monovision to determine the characteristics of ocular dominance. The dominant eye was determined using the hole-in-card test (sighting dominance). The contrast of target in nondominant eye was fixed at 100%; the contrast of target in the dominant eye varied (ie, 100% to 80% to 60% to 40% to 20%) using rectangular gratings of 2 cycles per degree that were 4 degrees in size.


RESULTS
In the successful monovision group, the reversal thresholds (ie, exclusive visibility of the nondominant eye crosses over that of the dominant eye) were displayed only at low decreasing contrast (80% and 60%). However, in the unsuccessful monovision group, the reversal thresholds were at high decreasing contrast (20%) or not at all. The reversal thresholds in patients with unsuccessful monovision were at a significantly lower contrast than in patients with successful monovision (P<.05).


CONCLUSIONS
Success and patient satisfaction in monovision patients were significantly influenced by the magnitude of ocular dominance. The balance technique seems to be a good method to evaluate the quantity of ocular dominance and prospectively evaluate the monovision technique.
Handa
Tomoya
T
Doctor's Program of Medical Science, Kitasato University Graduate School, 1-15-1 Kitasato, Sagamihara-shi 228-8555, Japan. tomoya.handa@nifty.com
Mukuno
Kazuo
K
Uozato
Hiroshi
H
Niida
Takahiro
T
Shoji
Nobuyuki
N
Minei
Risako
R
Nitta
Marie
M
Shimizu
Kimiya
K
D000328:Adult; D000368:Aged; D023882:Dominance, Ocular / Q000502:physiology*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D018918:Phacoemulsification; D014787:Vision Tests; D015349:Vision, Monocular / Q000502:physiology*; D014792:Visual Acuity