Skip to content

Outcomes and quality of life

TL;DR — Cataract surgery has at least six non-interchangeable outcome domains: visual acuity, refractive prediction error, contrast and glare, reading, patient-reported visual function, and complications (Qin 2018, PMID 28937505). Acuity is the weakest of these as a measure of what surgery is for: the VF-14 correlated better with patients' own assessment of trouble with their vision than any acuity measure did, and was about three times more responsive to surgery than a generic health-status instrument (effect size ~1.00 vs 0.30) (Steinberg 1994, PMID 8185520; Cassard 1995, PMID 7487617). Modern Rasch-scaled PROMs have made routine measurement feasible — Cat-PROM5 and Catquest-9SF have person reliability 0.90 and 0.88 and standardised responsiveness 1.45 and 1.47 SD, and correlate 0.85 with each other (Sparrow 2018, PMID 29386619). Downstream benefits are real but smaller than often claimed: fall incidence fell from 1.17 per year (95% CI 0.95–1.43) before surgery to 0.81 (0.63–1.04) after first-eye surgery in a prospective cohort (Keay 2022, PMID 35702892), while a randomised trial of expedited second-eye surgery in 239 women found improved visual disability, confidence and health status but a non-significant 32% reduction in fall rate (rate ratio 0.68, 95% CI 0.39–1.19, P = 0.18) (Foss 2006, PMID 16364936). And outcomes are limited by the rest of the eye: ocular comorbidity accounted for 78.1% of poor visual outcomes in a national survey where only 79.5% of operated eyes achieved a good result (Sándor 2020, PMID 32309181).

The outcome domains

Domain Typical metric Why it is not redundant
Distance acuity logMAR corrected and uncorrected Insensitive to glare, contrast loss and near function
Refractive prediction error Mean/median absolute error; % within ±0.5 D and ±1.0 D Determines spectacle dependence; benchmark 71% within ±0.5 D in the FACT trial (Day 2020, PMID 32386810)
Contrast and glare Contrast sensitivity, defocus curves Moves independently of high-contrast acuity (Karbassi 1993, PMID 8302532)
Reading Reading speed and near acuity The commonest reported functional complaint
Patient-reported visual function VF-14, Catquest-9SF, Cat-PROM5 The only domain that measures the patient's own criterion of benefit
Complications PCR, endophthalmitis, CME, dysphotopsia Rare; requires registry-scale denominators

Registry tracking of these outcomes has been shown to improve outcomes, spread best practice, reduce costs and increase delivered value (PMID 28937505). Instruments and thresholds must be stated: a "success rate" without a definition is uninterpretable, as the FEMCAT composite (four simultaneous criteria, met by 41.1% and 43.6% of eyes) demonstrates against the FACT non-inferiority margin of 0.1 logMAR (Schweitzer 2020, PMID 31954466; PMID 32386810).

Patient-reported outcome measures

Instrument Properties Source
VF-14 14 items; Cronbach's α = 0.85; correlates with patient-rated trouble and satisfaction better than acuity or the Sickness Impact Profile; only moderately correlated with better-eye acuity Steinberg 1994, PMID 8185520
VF-14 reproducibility/responsiveness ICC 0.79 using patient-rated stability; ~3× more responsive than the Sickness Impact Profile (effect size ~1.00 vs 0.30) Cassard 1995, PMID 7487617
VF-14 item performance Item-specific responses examined for shortening the instrument in first-eye surgery Friedman 2002, PMID 12140210
Catquest-9SF Rasch-scaled from 21,364 Swedish register questionnaires; person separation 2.65; correlates with acuity r = 0.43 preoperatively and 0.48 postoperatively; highly responsive (−0.32 ± 2.15 to −3.21 ± 2.50 logits) Lundström 2009, PMID 19251145
Catquest-9SF cross-population validity 13 studies, n = 15,289: unidimensional, ordered thresholds, acceptable precision everywhere; 9 studies showed significant mistargeting (items easy relative to respondent ability); recommend revalidation in each new population Kabanovski 2020, PMID 31862206
Catquest-9SF minimum important difference Anchor-based MID −0.5 in patients with better preoperative function and −1.80 in those with worse; Cohen effect-size-based MID −1.07 and −1.46 Grimfors 2022, PMID 36494767
Cat-PROM5 vs Catquest-9SF Person reliability 0.90 vs 0.88; responsiveness 1.45 vs 1.47 SD; correlation R = 0.85; both acceptable to patients including those with comorbidity; preference expressed for the shorter Cat-PROM5 Sparrow 2018, PMID 29386619

Two consequences follow. First, the MID differs by baseline function — a patient with better preoperative vision needs a smaller change to notice benefit (PMID 36494767) — so a single responder threshold applied across a service will systematically misclassify. Second, mistargeting means these instruments were built for populations with worse vision than many contemporary surgical candidates (PMID 31862206), which matters as indications move toward earlier surgery. Work on combining acuity and PROMs into an explicit appropriateness and prioritisation tool addresses exactly this (Schlenker 2023, PMID 36028007).

Quality of life

An umbrella review of 69 systematic reviews found a consistent association between vision impairment, eye disease and reduced quality of life; of 33 unique ophthalmic interventions examined across 60 reviews, 25 improved quality of life, and timely cataract surgery was named among them (Assi 2021, PMID 33576772). Qualitative work adds the texture the questionnaires miss: in five focus groups with 26 postoperative participants, themes covered adaptation to changed vision, the postoperative spectacle prescription, and difficulties in everyday activities alongside high overall satisfaction (Webber 2020, PMID 32654259). Editorial framing in the field increasingly separates "quality of vision" from acuity (Mencucci 2023, PMID 37457565; Nemet 2023, PMID 36902768).

Falls, mobility and driving

Finding Value Design Source
Fall incidence before surgery 1.17 per year (95% CI 0.95–1.43) 409 people ≥65 awaiting bilateral surgery, 8 Australian tertiary clinics Keay 2022, PMID 35702892
Fall incidence after first-eye surgery 0.81 per year (0.63–1.04) same PMID 35702892
Expedited vs delayed second-eye surgery, fall rate Rate ratio 0.68 (0.39–1.19), P = 0.18 — not significant; 40% of operated and 34% of unoperated participants fell at least once over 12 months RCT, 239 women >70 Foss 2006, PMID 16364936
Expedited second-eye surgery, other outcomes Visual function (especially stereopsis), confidence, visual disability and handicap all improved same PMID 16364936
Cataract surgery as a fall-prevention intervention Named among effective single interventions alongside exercise, physical therapy and medication reduction Clinical review of falls evidence Tinetti 2010, PMID 20085954
Falls prevention generally Multiple-component group exercise RaR 0.71 (0.63–0.82); home-based exercise RaR 0.68 (0.58–0.80); multifactorial interventions RaR 0.76 (0.67–0.86) Cochrane, 159 trials, 79,193 participants Gillespie 2012, PMID 22972103
Visual impairment and falls Roughly doubles fall risk across studies; relationship almost certainly causal; vision accounts for perhaps a quarter to a half of falls, imprecisely estimated Review Harwood 2001, PMID 11769782
Vision and crash risk Visual field defects RR 1.51 (1.23–1.85); contrast sensitivity RR 1.40 (1.08–1.80); acuity loss RR 1.21 (1.02–1.43) 101 studies, 778,052 participants; most meta-analyses underpowered Nguyen 2023, PMID 37567751
Falls and activity in a low-resource setting 340 patients ≥50 awaiting first-eye surgery in Ho Chi Minh City; self-reported falls related to physical activity, Catquest-9SF disability, acuity and contrast sensitivity Cross-sectional To 2022, PMID 33627039

The honest summary is that vision impairment is a strong fall risk factor and cataract surgery is one of the few single interventions with supportive trial evidence, but the second-eye trial did not demonstrate a significant fall reduction and older reviews note that no intervention had at that time been proven to reduce fall risk in a randomised trial (PMID 11769782; PMID 16364936). Contemporary clinical reviews report >30% lower fall rates and 20–30% lower dementia rates associated with cataract surgery (Chen 2025, PMID 40227658); those are association estimates, not trial effects. Editorial argument that prompt access to surgery is a falls-prevention measure follows from the cohort data (Foss 2022, PMID 35722714). Vision and falls more generally are reviewed in (Black 2005, PMID 16083415).

First eye, second eye

The two operations answer different questions. Fall incidence in the Australian cohort was 1.17/year before surgery, 0.81/year after first-eye surgery (PMID 35702892). Second-eye surgery restores binocular function — stereopsis in particular — and improved visual disability, confidence and health status in the randomised trial, without a demonstrable fall reduction (PMID 16364936). The value-for-money argument about second-eye surgery has been contested since at least the 1990s (Harwood 2014, PMID 24727318). Between-eye imbalance is a real harm in its own right: in the BICAT-NL randomised comparison of immediate versus delayed sequential surgery, disturbing anisometropia was the one adverse event that differed significantly (p = 0.0001), favouring immediate surgery (Spekreijse 2023, PMID 37201546).

Registry benchmarks and risk adjustment

EUREQUO provides the largest outcome denominators available: over 820,000 surgeries by 2011, with evidence-based guidelines derived from 523,921 extractions (Lundström 2012, PMID 22541829), and later analyses spanning 1.35–2.85 million operations (Lundström 2021, PMID 33086294; Lundström 2015, PMID 26613089). Benchmarks from that source: corrected acuity 0.5 or better in 95.6% of non-vitrectomised and 82.8% of previously vitrectomised eyes, with mean absolute prediction error 0.43 D and 0.52 D respectively (Lundström 2020, PMID 32649433); mean corrected acuity 0.05 ± 0.16 logMAR and mean absolute prediction error 0.41 ± 0.45 D without PCR, deteriorating to 0.13 ± 0.21 logMAR and 1.15 ± 1.60 D with PCR (Segers 2022, PMID 35179858).

Risk adjustment is the unfinished business. The UK Cataract National Dataset identified the preoperative indicators that any fair comparison must handle — older age, short axial length, any ocular comorbidity, AMD, diabetic retinopathy, amblyopia, corneal pathology, previous vitrectomy, and intraoperative PCR (OR 5.74 for acuity loss) (Sparrow 2012, PMID 22441022) — and showed that surgeon-level PCR variation is greatest where case numbers are smallest, concluding that acceptable benchmark limits cannot be set without case-mix adjustment (Johnston 2010, PMID 19680280). The consequence at population level is stark: in the Hungarian RAAB survey, age- and sex-adjusted cataract surgical coverage at VA<3/60 reached 90.0%, yet only 79.5% of operated eyes had a good visual outcome, and ocular comorbidity explained 78.1% of the poor outcomes (PMID 32309181). That gap is precisely what effective cataract surgical coverage is designed to capture (access, equity and service delivery).

Residual dissatisfaction after technically successful surgery

Three sources dominate. Refractive surprise — the benchmark is 71% within ±0.5 D in a randomised trial (PMID 32386810) — managed by enhancement, of which LASIK is the most accurate and lens-based options less predictable (Alio 2015, PMID 25321444). Dysphotopsia — positive phenomena in up to 67% early and 2.2% persistently at one year, negative in up to 26% early and 0.13–3% persistently (Pusnik 2022, PMID 36676002; Hu 2018, PMID 29084005). Residual ocular surface disease, which surgery induces or exaggerates and which itself degrades refractive outcomes (Sarnicola 2024, PMID 38018802); a randomised trial of perioperative low-level light therapy used the Ocular Surface Disease Index as its primary outcome with tear biomarkers as exploratory endpoints (Timofte-Zorila 2026, PMID 42162158).

Economics of the outcome

Cost-utility of first-eye surgery ranged $245–$22,000/QALY in Western countries and $9–$1,600/QALY in developing countries — comparable to hip arthroplasty and better than knee arthroplasty or defibrillator implantation (Lansingh 2007, PMID 17383730). For IOL choice specifically, 14 economic evaluations across 12 countries reported lifetime societal costs for multifocal IOLs of $5,780.79–$15,944.76 with QALY gains of 0.16–0.71 (Wu 2025, PMID 40838946). The methodological state of the field is summarised in a narrative review of economic evaluations in cataract surgery (Ginel 2024, PMID 38347178).

Open questions

  • Which PROM, and with which responder threshold? Cat-PROM5 and Catquest-9SF perform comparably (PMID 29386619), MIDs differ by baseline function (−0.5 vs −1.80 logits) (PMID 36494767) and mistargeting is common (PMID 31862206) — so a single service-wide responder definition is not currently defensible, and none has been validated.
  • Does surgery reduce falls, or does it reduce something correlated with falls? Cohort data show a fall in incidence after first-eye surgery (PMID 35702892) and reviews name surgery among effective interventions (PMID 20085954), but the one randomised second-eye trial found a non-significant 32% reduction (PMID 16364936) and no adequately powered randomised first-eye falls trial appears in this evidence set.
  • What risk-adjustment model should registries use? The predictors are known (PMID 22441022) and the need is stated explicitly (PMID 19680280; PMID 22541829), but no validated adjustment model is in shared use.
  • Is there a culturally portable PROM? Catquest-9SF has been validated in many populations but the authors recommend revalidation before each new use (PMID 31862206); no instrument with demonstrated cross-cultural measurement invariance was identified in the searches behind this page.
  • Do the dementia and mortality associations survive confounding control? Reviews report 20–30% lower dementia rates after surgery (PMID 40227658); no design capable of separating the effect of surgery from the health status that leads to being offered surgery was identified in this evidence set.

References

  1. Qin VL, Conti FF, Singh RP. Measuring outcomes in cataract surgery. Current opinion in ophthalmology. 2018;29:100-104. PMID 28937505
  2. Steinberg EP, Tielsch JM, Schein OD, et al. The VF-14. An index of functional impairment in patients with cataract. Archives of ophthalmology (Chicago, Ill. : 1960). 1994;112:630-8. PMID 8185520
  3. Cassard SD, Patrick DL, Damiano AM, et al. Reproducibility and responsiveness of the VF-14. An index of functional impairment in patients with cataracts. Archives of ophthalmology (Chicago, Ill. : 1960). 1995;113:1508-13. PMID 7487617
  4. Sparrow JM, Grzeda MT, Frost NA, et al. Cataract surgery patient-reported outcome measures: a head-to-head comparison of the psychometric performance and patient acceptability of the Cat-PROM5 and Catquest-9SF self-report questionnaires. Eye (London, England). 2018;32:788-795. PMID 29386619
  5. Keay L, Ho KC, Rogers K, et al. The incidence of falls after first and second eye cataract surgery: a longitudinal cohort study. The Medical journal of Australia. 2022;217:94-99. PMID 35702892
  6. Foss AJ, Harwood RH, Osborn F, et al. Falls and health status in elderly women following second eye cataract surgery: a randomised controlled trial. Age and ageing. 2006;35:66-71. PMID 16364936
  7. Sándor GL, Tóth G, Szabó D, et al. Cataract blindness in Hungary. International journal of ophthalmology. 2020;13:438-444. PMID 32309181
  8. Day AC, Burr JM, Bennett K, et al. Femtosecond Laser-Assisted Cataract Surgery Versus Phacoemulsification Cataract Surgery (FACT): A Randomized Noninferiority Trial. Ophthalmology. 2020;127:1012-1019. PMID 32386810
  9. Karbassi M, Magnante PC, Wolfe JK, et al. Objective line spread function measurements, Snellen acuity, and LOCS II classification in patients with cataract. Optometry and vision science : official publication of the American Academy of Optometry. 1993;70:956-62. PMID 8302532
  10. Schweitzer C, Brezin A, Cochener B, et al. Femtosecond laser-assisted versus phacoemulsification cataract surgery (FEMCAT): a multicentre participant-masked randomised superiority and cost-effectiveness trial. Lancet (London, England). 2020;395:212-224. PMID 31954466
  11. Friedman DS, Tielsch JM, Vitale S, et al. VF-14 item specific responses in patients undergoing first eye cataract surgery: can the length of the VF-14 be reduced?. The British journal of ophthalmology. 2002;86:885-91. PMID 12140210
  12. Lundström M, Pesudovs K. Catquest-9SF patient outcomes questionnaire: nine-item short-form Rasch-scaled revision of the Catquest questionnaire. Journal of cataract and refractive surgery. 2009;35:504-13. PMID 19251145
  13. Kabanovski A, Hatch W, Chaudhary V, et al. Validation and application of Catquest-9SF in various populations: A systematic review. Survey of ophthalmology. 2020;65:348-360. PMID 31862206
  14. Grimfors M, Lundström M, Kugelberg M. Self-assessed visual function outcome in cataract surgery: minimum important difference of the Catquest-9SF questionnaire. Eye and vision (London, England). 2022;9:46. PMID 36494767
  15. Schlenker MB, Sayal AP, Yang M, et al. Visual acuity, patient-reported outcome measures, or both? The development of an evidence-based appropriateness and prioritization tool for cataract surgery patients. Canadian journal of ophthalmology. Journal canadien d'ophtalmologie. 2023;58:e74-e76. PMID 36028007
  16. Assi L, Chamseddine F, Ibrahim P, et al. A Global Assessment of Eye Health and Quality of Life: A Systematic Review of Systematic Reviews. JAMA ophthalmology. 2021;139:526-541. PMID 33576772
  17. Webber KJ, Fylan F, Wood JM, et al. Experiences following cataract surgery - patient perspectives. Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists). 2020;40:540-548. PMID 32654259
  18. Mencucci R, Favuzza E, Ribeiro F. Editorial: Addressing the unmet needs of cataract patients: when quality of vision can make the difference in quality of life. Frontiers in medicine. 2023;10:1232243. PMID 37457565
  19. Nemet A, Kanclerz P, Tuuminen R. Should Multifocal Intraocular Lenses Become a Standard in Phacoemulsification Cataract Surgery?. Journal of clinical medicine. 2023;12. PMID 36902768
  20. Tinetti ME, Kumar C. The patient who falls: "It's always a trade-off". JAMA. 2010;303:258-66. PMID 20085954
  21. Gillespie LD, Robertson MC, Gillespie WJ, et al. Interventions for preventing falls in older people living in the community. The Cochrane database of systematic reviews. 2012;2012:CD007146. PMID 22972103
  22. Harwood RH. Visual problems and falls. Age and ageing. 2001;30 Suppl 4:13-8. PMID 11769782
  23. Nguyen H, Di Tanna GL, Coxon K, et al. Associations between vision impairment and vision-related interventions on crash risk and driving cessation: systematic review and meta-analysis. BMJ open. 2023;13:e065210. PMID 37567751
  24. To Q, Huynh VA, Do D, et al. Falls and Physical Activity among Cataract Patients in Vietnam. Ophthalmic epidemiology. 2022;29:70-77. PMID 33627039
  25. Chen SP, Woreta F, Chang DF. Cataracts: A Review. JAMA. 2025;333:2093-2103. PMID 40227658
  26. Foss A. Prompt access to cataract surgery is vital for preventing falls in older people. The Medical journal of Australia. 2022;217:84-85. PMID 35722714
  27. Black A, Wood J. Vision and falls. Clinical & experimental optometry. 2005;88:212-22. PMID 16083415
  28. Harwood RH, Foss AJ. Second-eye cataract surgery: valuable investment or unaffordable luxury?. Age and ageing. 2014;43:310-2. PMID 24727318
  29. Spekreijse L, Simons R, Winkens B, et al. Safety, effectiveness, and cost-effectiveness of immediate versus delayed sequential bilateral cataract surgery in the Netherlands (BICAT-NL study): a multicentre, non-inferiority, randomised controlled trial. Lancet (London, England). 2023;401:1951-1962. PMID 37201546
  30. Lundström M, Barry P, Henry Y, et al. Evidence-based guidelines for cataract surgery: guidelines based on data in the European Registry of Quality Outcomes for Cataract and Refractive Surgery database. Journal of cataract and refractive surgery. 2012;38:1086-93. PMID 22541829
  31. Lundström M, Dickman M, Henry Y, et al. Changing practice patterns in European cataract surgery as reflected in the European Registry of Quality Outcomes for Cataract and Refractive Surgery 2008 to 2017. Journal of cataract and refractive surgery. 2021;47:373-378. PMID 33086294
  32. Lundström M, Manning S, Barry P, et al. The European registry of quality outcomes for cataract and refractive surgery (EUREQUO): a database study of trends in volumes, surgical techniques and outcomes of refractive surgery. Eye and vision (London, England). 2015;2:8. PMID 26613089
  33. Lundström M, Dickman M, Henry Y, et al. Cataract surgery of eyes with previous vitrectomy: risks and benefits as reflected in the European Registry of Quality Outcomes for Cataract and Refractive Surgery. Journal of cataract and refractive surgery. 2020;46:1402-1407. PMID 32649433
  34. Segers MHM, Behndig A, van den Biggelaar FJHM, et al. Outcomes of cataract surgery complicated by posterior capsule rupture in the European Registry of Quality Outcomes for Cataract and Refractive Surgery. Journal of cataract and refractive surgery. 2022;48:942-946. PMID 35179858
  35. Sparrow JM, Taylor H, Qureshi K, et al. The Cataract National Dataset electronic multi-centre audit of 55,567 operations: risk indicators for monocular visual acuity outcomes. Eye (London, England). 2012;26:821-6. PMID 22441022
  36. Johnston RL, Taylor H, Smith R, et al. The Cataract National Dataset electronic multi-centre audit of 55,567 operations: variation in posterior capsule rupture rates between surgeons. Eye (London, England). 2010;24:888-93. PMID 19680280
  37. Alio JL, Abdelghany AA, Fernández-Buenaga R. Enhancements after cataract surgery. Current opinion in ophthalmology. 2015;26:50-5. PMID 25321444
  38. Pusnik A, Petrovski G, Lumi X. Dysphotopsias or Unwanted Visual Phenomena after Cataract Surgery. Life (Basel, Switzerland). 2022;13. PMID 36676002
  39. Hu J, Sella R, Afshari NA. Dysphotopsia: a multifaceted optic phenomenon. Current opinion in ophthalmology. 2018;29:61-68. PMID 29084005
  40. Sarnicola E, Sarnicola C, De Bernardo M, et al. Cataract surgery in setting of ocular surface disease. Current opinion in ophthalmology. 2024;35:155-162. PMID 38018802
  41. Timofte-Zorila MM, Pavel-Tanasa M, Giannaccare G, et al. Tear biomarker changes and ocular surface recovery with low-level light therapy after cataract surgery: a double-masked randomized controlled clinical trial. Scientific reports. 2026;16. PMID 42162158
  42. Lansingh VC, Carter MJ, Martens M. Global cost-effectiveness of cataract surgery. Ophthalmology. 2007;114:1670-8. PMID 17383730
  43. Wu Z, Cheng F, Xu J. Economic Evaluation of Intraocular Lens Targeting Cataract Patients: A Review and Future Directions. Translational vision science & technology. 2025;14:30. PMID 40838946
  44. Ginel J, Burguera N, Piñero D, et al. Economic evaluations in cataract surgery: a narrative review. Eye (London, England). 2024;38:1418-1424. PMID 38347178