Ng Si RuiOphthalmology education

Cataract lens choices

Lens targets and everyday working distances

Compare monofocal, extended depth-of-focus and trifocal strategies across familiar tasks.

Lens design
A desk with a phone held near, a laptop at intermediate distance, and a colleague beside a distant Singapore view
ngsirui.com · This is a general illustration of working distances and not a guarantee of final results. The range of vision, contrast, visual effects and need for spectacles vary for different patients.
NearPhone35–40 cmIntermediateLaptopabout 66 cmDistanceColleague and viewacross the room and beyond
View through
Right eye target0.00 D · distance

Monofocal right eye: 0.00 D · distance.

When different targets are used between the two eyes, the experience with both eyes open depends on ocular dominance, binocular function and neuroadaptation.