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Clinical Review

Recent advances in customising cataract surgery

BMJ 2004; 328 doi: https://doi.org/10.1136/bmj.328.7431.92 (Published 09 January 2004) Cite this as: BMJ 2004;328:92

Data supplement

  • Table A Risk factors for cataractw1

    Table B Variation in predicted power (in dioptres) of intraocular lens with different lens formulas ...

    Table C Postoperative complications of cataract surgeryw9

    Web references
     
     

    Table ARisk factors for cataractw1

      Risk
      Odds ratio
      Age
      1.40w2
      Sex—women:men, 1.22:1
      3.03w3
      Diabetes mellitus
      2.72w3
      Sunlight
      1.10w4
      Toxicity to drugs, including steroids, chlorpromazine, bulsulphan, amiodarone, gold
      3.25 (steroids)w3
      Nutrition and socioeconomic status
      1.47-1.90w5
      Lifestyle:
      Smoking
      2.35-3.75w3
      Alcohol
      1.34-1.57w6
      Ocular disease—uveitis, glaucoma, high myopia
      1.99 (myopia)w2
      Ocular trauma
      2.4w7
      Dehydration or diarrhoeal crisis
      3.1w8

       

      Table B Variation in predicted power (in dioptres) of intraocular lens with different lens formulas (assuming an A constant of 118 and mean K reading of 42.5D)

        Axial length (mm)
        SRK-T formula
        Hoffer-Q formula
        Holladay-II formula
        SRK-II formula
        18
        41.6
        45.6
        43.3
        37.8
        20
        32.9
        34.6
        33.9
        31.8
        22
        25.8
        26.6
        26.3
        24.8
        26
        13.9
        13.8
        13.8
        14.3
        32
        - 0.3
        - 1.2
        - 0.7
        - 0.7

        A 2 dioptre difference represents about three lines on a Snellen visual acuity chart.  
         

        Table C Postoperative complications of cataract surgeryw9

          Early (within 48 hours)Signs and symptoms
          Frequency (%)
          Corneal oedema*Cloudy vision
          9.5
          Raised intraocular pressure*Pain, ± nausea and vomiting
          7.9
          Uveitis (more than expected)Pain, redness
          5.6
          Wound leak or ruptureWatering eye, reduced vision
          1.2
          External eye infectionRedness, discharge
          0.06
          Internal eye infection (endophthalmitis)†Severe pain, reduced vision
          0.03
          Retinal detachment†Flashes, floaters, ± reduced vision
          0.03
          Retinal tearFlashes, floaters
          0.02
          Late (48 hours to 3-4 months)Signs and symptoms
          Frequency (%)
          Endophthalmitis†Severe pain, reduced vision
          0.1
          Retinal detachment and tear†Flashes, floaters, ± reduced vision
          0.14

          *Generally short lived and self-limiting.

          †Likely to cause permanent visual loss.
           

          Web references

          1. Dolin P. Epidemiology of cataract. In: Johnson GJ, Minassian DC, Weale R, eds. The epidemiology of eye disease. London: Chapman and Hall Medical, 1998;ch 5:103-19.
          2. Klein BE, Klein R, Moss SE. Incident cataract surgery: the Beaver Dam study. Ophthalmology 1997;104:573-80.
          3. Delcourt C, Cristol JP, Tessier F, Leger CL, Michel F, Papoz L. Risk factors for cortical, nuclear and posterior subcapsular cataract: the POLA study. Am J Epidemiology 2000;151:497-504.
          4. West SK, Duncan DD, Munoz B, Rubin GS, Fried LP, Bandeen-Roche K, et al. Sunlight exposure and risk of lens opacity in a population based study: the Salisbury eye evaluation project. JAMA 1998;289:714-8.
          5. Leske MC, Wu SY, Connell AM, Hyman L, Schachat AP. Lens opacities, demographic factors and nutritional supplements in the Barbados eye study. Int J Epidemiology 1997;26:1314-22.
          6. Ritter LL, Klein BE, Klein R, Mares-Perlman JA. Alcohol use and lens opacities in the Beaver Dam eye study. Arch Ophthalmol 1993;111:113-7.
          7. Wong TY, Klein BE, Klein R, Tomany SC. Relation of ocular trauma to cortical, nuclear, and posterior subcapsular cataracts: the Beaver Dam eye study. Br J Ophthalmol 2002;86:152-5.
          8. Zodpey SP, Ughade SN, Khanolkar VA, Shrikhande SN. Dehydrational crisis from severe diarrhoea and risk of age-related cataract. J Indian Med Assoc 1999;97:13-5.
          9. Desai P, Misassian DC, Reidy A. The national cataract survey 1997/98: a report of the results of the clinical outcomes. Br J Ophthalmol 1999;83:1336-40.

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