A pilot study to determine if intraocular lens choice at the time of cataract surgery has an impact on patient-reported driving habits

Figures & data

Table 1 Subject demographics by intraocular lens (IOL) group

	SN60WF group	ZCB00 group	P-value
Number	51	39
Age (years), mean ± SD	77.57±7.24	76.13±7.85	0.370#
Male/female	19/32	13/26	0.700*
Glaucoma (yes/no)	6/45	6/33	0.617*
Diabetes mellitus (yes/no)	6/45	6/33	0.880*
IOL power, mean ± SD	21.08±3.44	20.44±3.45	0.217#
Months since first surgery, mean ± SD	34.59±1.84	43.26±6.15
Months since second surgery, mean ± SD	28.61±4.36	38.36±6.17

Notes:

# Analysis of variance;

* χ² test.

Abbreviation: SD, standard deviation.

Table 2 Current driving

DHQ item	Response	SN60WF group (%)	ZCB00 group (%)	P-value*
Currently drive?	Yes	78.4	82.1	0.671
	No	21.6	17.9
Wear glasses or contact lenses when driving?	Yes	50.0	37.5	0.289
	No	50.0	62.5
Wear seatbelt when driving?	Yes	100	100
	No	0	0
How do you prefer to get around?	Drive self	85.0	78.1	0.451
	Someone else drive	15.0	21.9
How fast do you usually drive compared to the general flow of traffic?	Same/faster	80.0	93.8	0.094
	Slower	20.0	6.3
Has anyone suggested over the past year that you limit or stop driving?	Yes	10.0	6.3	0.567
	No	90.0	93.8
How would you rate the quality of your driving?	Above average	92.5	100	0.114
	Average	7.5	0
If you did not want to drive yourself, how would you get someplace?	Ask friend/relative	77.5	78.1	0.823
	Taxi/bus	10	6.3
	Drive self anyway	10	9.4
	Cancel plans	2.5	6.3

Note:

* χ² test.

Abbreviation: DHQ, Driving Habits Questionnaire.

Table 3 Driving Habits Questionnaire: Driving exposure and driving dependency

Item	Response	SN60WF group (%)	ZCB00 group (%)	P-value
Number of days per week	≥5	57.5	65.6	0.482*
	<5	42.5	34.4
Number of places per day		2.750±1.214	2.844±0.920	0.710#
Number of places per week		2.526±4.183	1.525±1.580	0.162#
Number of miles per day	≥5	62.5	62.5	0.791*
	<5	30.0	34.4
Number of people that regularly travel with you	≥4	7.5	3.1	0.421*
	<4	92.5	96.9
When traveling with others, do you usually drive?	Yes	45.0	43.8	0.442*
	No	32.5	21.9
	Share	17.5	28.1

Notes:

* χ² test;

# analysis of variance.

Abbreviation: DHQ, Driving Habits Questionnaire.

Table 4 Driving Habits Questionnaire: Driving difficulty

During the past 3 months, have you experienced difficulty…	Response	SN60WF group (%)	ZCB00 group (%)	P-value*
Driving when it is raining?	No difficulty	90.0	90.6	0.929
	Difficulty	10.0	9.4
Driving alone?	No difficulty	100	100	NA
	Difficulty	0	0
Parallel parking?	No difficulty	65.0	78.1	0.223
	Difficulty	35.0	21.9
Making left-hand turns across oncoming traffic?	No difficulty	92.5	90.6	0.775
	Difficulty	7.5	9.4
Driving on highways?	No difficulty	75.0	81.3	0.526
	Difficulty	25.0	18.8
Driving on high-traffic roads?	No difficulty	87.5	93.8	0.374
	Difficulty	12.5	6.3
Driving at night?	No difficulty	82.5	93.8	0.151
	Difficulty	17.5	6.3
Driving at night with moderate-to-severe difficulty?	No difficulty	10.0	3.1	0.197
	Difficulty	72.5	90.6
Driving in rush-hour traffic?	No difficulty	82.5	87.5	0.558
	Difficulty	17.5	12.5

Note:

* χ² test.

Abbreviation: NA, not applicable.

Table 5 Driving Habits Questionnaire: Driving space

In the past year, have you driven…	Response	SN60WF group (%)	ZCB00 group (%)	P-value*
In your immediate neighborhood?	Yes	100	100	NA
	No	0	0
Beyond the neighborhood?	Yes	92.5	100	0.114
	No	7.5	0
To neighboring towns?	Yes	92.5	96.9	0.421
	No	7.5	3.1
Outside the province?	Yes	30.0	34.4	0.692
	No	70.0	65.6
Outside central Canada?	Yes	27.5	21.9	0.584
	No	72.5	78.1

Note:

* χ² test.

Abbreviation: NA, not applicable.

Table 6 Driving Habits Questionnaire: Self-reported crashes and citations

In the past year, have you…	Response	SN60WF group (%)	ZCB00 group (%)	P-value*
Been involved in an accident when you were the driver?	Yes	10.0	0	0.066
	No	90.0	100
Been pulled over by police, regardless of whether you received a ticket?	Yes	7.5	6.3	0.836
	No	92.5	93.8
Received a traffic ticket (other than a parking ticket)?	Yes	7.5	3.1	0.421
	No	92.5	96.9

Note:

* χ² test.