Table 4.

Example of 15 different expressions used to ask about diplopia named in the 56 studies of the review.

Expression	Author and year	Questionnaire used
Do you have double vision when reading or doing close work?	Borsting E, 201213, Barnhardt C, 201214, Pang Y, 201215, Scheiman M, 201116, Alvarez T, 201019, Scheiman M, 201020, Rouse M, 200923, Teitelbaum B, 200925, Kulp M, 200926, Cooper J, 200927, CITT, 200929, Borsting E, 200832, Kulp M, 200833, CITT, 200834, CITT, 200835, Marran L, 20068, Scheiman M, 200543, Scheiman M, 200544, Scheiman M, 200545, Rouse M, 200446, Borsting E, 200348	CISS V-15
Diplopia	Serna A, 201117, Bodack M, 200738, Aziz S, 200639, Cacho P, 2002 50, Gallaway M, 199758, Dwyer P, 199261, Rouse M, 199854	None (Case History)
Do the letters on a page ever appear as a double image when you are reading?	Chase C, 200928, Borsting E, 200832, Borsting E, 200737	Conlon Survey
Occasional diplopia	Brautaset R, 200640, Rutstein R, 198864	None (Case History)
Intermittent diplopia	Abdi S, 20057, Porcar E, 199757	None (Case History)
Do you ever see double when you read?	Birnbaum M, 199956	Birnbaum questionnaire
When you do near work, do you (at least 25% of the time) get headaches, double vision or eyestrain; do you lose concentration; do your eyes feel tired, pull, ache, or jump or run together?	Birnbaum M, 199956	Birnbaum questionnaire
Is it difficult to do near work (reading, writing, etc.) for at least 1 half hour without discomfort (i.e., headaches, eyestrain, tiredness, eye ache, burning, stinging, wateriness, blurring, double vision, or loss of concentration)?	Birnbaum M, 199956	Birnbaum questionnaire
Do you have double vision or see words split into two (or demo) when you read or study?	Borsting E, 20039	CISS 16 items
¿Has your child reported double vision when reading or studying?	Borsting E, 199955	CIRS Symptom questionnaire parent version
Do you ever see 2 numbers or words on the paper when you know there is only one?	Adler P, 200249	Adler questionnaire
Asthenopia and diplopia during close work	Matsuo T, 199260	None (Case History)
When I read the material appears to split apart into two pieces.	Russell G, 199359	Russell questionnaire
Double vision	Abdi S, 20057	None (Case History)
Double vision when reading	Gallaway M, 200251	Gallaway questionnaire