Gap finder

Search review questions

Each row is one question a systematic review asked: who, what, compared with what, and which outcome, with the effect it found and how certain that is. Words match anywhere in the field.

Limit to evidence status or GRADE (optional)

2,112 questions in 171 reviews · Eyes and Vision

current versions
No studies 587 · 27.8%Ungraded 95 · 4.5%Very low 446 · 21.1%Low 557 · 26.4%Moderate 361 · 17.1%High 66 · 3.1%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

QuestionEffectEvidenceStatus / GRADE
Intervention NR
Adherence · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted7 studies · 902 participantsLow
Intervention NR
Intraocular pressure · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted5 studies · 503 participantsVery low
Intervention NR
Visual field defects · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted4 studies · 301 participantsVery low
Intervention NR
Quality of life · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted3 studies · 265 participantsVery low
Intervention NR
Adverse effects · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted8 studies · 650 participantsVery low
Intervention NR
Persistence · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted1 study · 127 participantsLow
Intervention NR
Intraocular pressure · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted2 studies · 193 participantsLow
Intervention NR
Visual field defects · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Quality of life · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Adverse effects · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Patient knowledge · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted4 studies · 390 participantsLow
Intervention NR
Adherence · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted8 studies · 650 participantsVery low
Intervention NR
Persistence · people with glaucoma or ocular hypertension
Interventions for improving adherence to ocular hypotensive therapy (2013) · Cochrane
no estimate extracted3 studies · 265 participantsVery low
Intervention NR
Good functional vision (presenting visual acuity 6/12 or better) · people with age‐related cataract
Manual small incision cataract surgery (MSICS) with posterior chamber intraocular lens versus… (2013) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Poor visual outcome (best‐corrected visual acuity worse than 6/60) · people with age‐related cataract
Manual small incision cataract surgery (MSICS) with posterior chamber intraocular lens versus… (2013) · Cochrane
OR 2.48 [0.74, 8.28]6 studies · 1250 participantsVery low
Intervention NR
Posterior capsule opacification 12 months after surgery · people with age‐related cataract
Manual small incision cataract surgery (MSICS) with posterior chamber intraocular lens versus… (2013) · Cochrane
no estimate extracted2 studies · 494 participantsVery low
Intervention NR
Other complications · people with age‐related cataract
Manual small incision cataract surgery (MSICS) with posterior chamber intraocular lens versus… (2013) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Quality of life · people with age‐related cataract
Manual small incision cataract surgery (MSICS) with posterior chamber intraocular lens versus… (2013) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Costs · people with age‐related cataract
Manual small incision cataract surgery (MSICS) with posterior chamber intraocular lens versus… (2013) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Visual impairment · people infected with O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
no estimate extracted2 studies · 354 participantsUngraded
Intervention NR
Punctate keratitis · people living in communities affected by O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 0.33 [0.22, 0.49]1 study · 551 participantsModerate
Intervention NR
Sclerosing keratitis · people living in communities affected by O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 0.74 [0.52, 1.06]1 study · 560 participantsLow
Intervention NR
Iridocyclitis · people living in communities affected by O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 0.62 [0.43, 0.9]1 study · 554 participantsModerate
Intervention NR
Chorioretinitis · people living in communities affected by O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 1.75 [0.91, 3.37]1 study · 528 participantsLow
Intervention NR
Optic nerve disease · people living in communities affected by O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 0.78 [0.57, 1.06]2 studies · 3577 participantsLow
Intervention NR
Visual field loss · people infected with O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
no estimate extracted0 studies · 0 participantsUngraded
Intervention NR
Punctate keratitis · people infected with O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
no estimate extracted0 studies · 2 participantsUngraded
Intervention NR
Sclerosing keratitis · people infected with O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 0.06 [0, 1.23]1 study · 39 participantsLow
Intervention NR
Iridocyclitis · people infected with O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
no estimate extracted0 studies · 2 participantsUngraded
Intervention NR
Chorioretinitis · people infected with O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 0.02 [0, 0.32]1 study · 200 participantsModerate
Intervention NR
Optic nerve disease · people infected with O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
no estimate extracted2 studies · 354 participantsUngraded
Intervention NR
Visual impairment · people living in communities affected by O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 1.08 [0.33, 3.5]1 study · 485 participantsVery low
Intervention NR
Visual field loss · people living in communities affected by O.volvulus
Ivermectin for onchocercal eye disease (river blindness) (2012) · Cochrane
RR 0.6 [0.41, 0.89]1 study · 636 participantsHigh
Intervention NR
Surgical failure (intraocular pressure >21mmHg) ( · patients with glaucoma surgery
Beta radiation for glaucoma surgery (2012) · Cochrane
RR 0.23 [0.14, 0.4]4 studies · 561 participantsModerate
Intervention NR
Intraocular pressure ( · patients with glaucoma surgery
Beta radiation for glaucoma surgery (2012) · Cochrane
no estimate extracted2 studies · 123 participantsLow
Intervention NR
Adverse effect: cataract · patients with glaucoma surgery
Beta radiation for glaucoma surgery (2012) · Cochrane
RR 1.79 [0.62, 5.14]3 studies · 423 participantsModerate
Sublingual immunotherapy vs placebo
Total ocular symptom scores Symptom scores · patients with allergic conjunctivitis
Sublingual immunotherapy for treating allergic conjunctivitis (2011) · Cochrane
no estimate extracted36 studies · 3399 participantsModerate
Sublingual immunotherapy vs placebo
Itchy/Gritty eyes Symptom scores · patients with allergic conjunctivitis
Sublingual immunotherapy for treating allergic conjunctivitis (2011) · Cochrane
no estimate extracted28 studies · 3020 participantsModerate
Sublingual immunotherapy vs placebo
Watery eyes Symptom scores · patients with allergic conjunctivitis
Sublingual immunotherapy for treating allergic conjunctivitis (2011) · Cochrane
no estimate extracted21 studies · 2641 participantsModerate
Sublingual immunotherapy vs placebo
Red eyes Symptom scores · patients with allergic conjunctivitis
Sublingual immunotherapy for treating allergic conjunctivitis (2011) · Cochrane
no estimate extracted20 studies · 1211 participantsModerate
Sublingual immunotherapy vs placebo
Eye drops Symptom scores · patients with allergic conjunctivitis
Sublingual immunotherapy for treating allergic conjunctivitis (2011) · Cochrane
no estimate extracted13 studies · 1038 participantsModerate
Sublingual immunotherapy vs placebo
Combined symptom‐medication scores Symptom scores · patients with allergic conjunctivitis
Sublingual immunotherapy for treating allergic conjunctivitis (2011) · Cochrane
no estimate extracted3 studies · 351 participantsModerate
Sublingual immunotherapy vs placebo
Conjunctival immediate allergen sensitivity Symptom scores · patients with allergic conjunctivitis
Sublingual immunotherapy for treating allergic conjunctivitis (2011) · Cochrane
no estimate extracted4 studies · 250 participantsModerate
Orientation & Mobility training vs physical exercise
Total score (using structured skills assessment) · patients with adults with low vision
Orientation and mobility training for adults with low vision (2010) · Cochrane
no estimate extracted2 studies · 67 participantsVery low
Intervention NR
Visual loss of 2+ lines at 1 year · patients with choroidal neovascularisation secondary to age‐related macular degeneration
Submacular surgery for choroidal neovascularisation secondary to age‐related macular degeneration (2009) · Cochrane
RR 0.96 [0.84, 1.09]2 studies · 715 participantsHigh
Intervention NR
Visual gain of 2+ lines at 1 year · patients with choroidal neovascularisation secondary to age‐related macular degeneration
Submacular surgery for choroidal neovascularisation secondary to age‐related macular degeneration (2009) · Cochrane
RR 1.06 [0.75, 1.5]2 studies · 715 participantsLow
Intervention NR
Contrast threshold loss ‐0.15 log units or more at 1 year · patients with choroidal neovascularisation secondary to age‐related macular degeneration
Submacular surgery for choroidal neovascularisation secondary to age‐related macular degeneration (2009) · Cochrane
RR 0.8 [0.63, 1.02]2 studies · 689 participantsModerate
Intervention NR
Reading speed 40 word/minute or more after 1 year · patients with choroidal neovascularisation secondary to age‐related macular degeneration
Submacular surgery for choroidal neovascularisation secondary to age‐related macular degeneration (2009) · Cochrane
RR 0.88 [0.64, 1.2]2 studies · 692 participantsHigh
Intervention NR
Loss of 6+ points of overall NEI‐VFQ score at 1 year · patients with choroidal neovascularisation secondary to age‐related macular degeneration
Submacular surgery for choroidal neovascularisation secondary to age‐related macular degeneration (2009) · Cochrane
RR 1.35 [1.09, 1.68]2 studies · 689 participantsLow
Intervention NR
Adverse events: cataract surgery at 1 year · patients with choroidal neovascularisation secondary to age‐related macular degeneration
Submacular surgery for choroidal neovascularisation secondary to age‐related macular degeneration (2009) · Cochrane
RR 8.69 [4.06, 18.61]2 studies · 632 participantsHigh