10/11/2012
Astigmatism and its prevalence
Astigmatism ‐ prevalence, insights & opportunities
Spherical or </=0.50DC
November 2012 24% 53% 23%
Anna Sulley BSc (Hons) MCOptom FBCLA FAAO Medical Affairs Associate Director EMA
>/=0.75DC in one eye only >/= 0.75DC in both eyes (N=11,624)
Young G, Sulley A and Hunt C. Prevalence of Astigmatism in Relation to Soft Contact Lens Fitting. Eye & Contact Lens 2011; 37 (1): 20‐25
Prevalence eyes with various levels astigmatism 30%
Prevalence astigmatism increases with age 30%
Hyperopes Myopes
25%
0.50DC or less >/= 0.75DC at least one eye
25%
All 31.7% myopes >0.75DC
15% 15.7% hyperopes >0.75DC
10% 5%
15%
10%
5%
0% 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 >2.50 Cylinder (D)
Young G, Sulley A and Hunt C. Prevalence of Astigmatism in Relation to Soft Contact Lens Fitting. Eye & Contact Lens 2011; 37 (1): 20‐25
50 45 40 35 30 25 20 15 10 5 0
0% 8‐19
20‐29
30‐39
40‐49
50‐59
60‐70
Age range (Years) Young G, Sulley A and Hunt C. Prevalence of Astigmatism in Relation to Soft Contact Lens Fitting. Eye & Contact Lens 2011; 37 (1): 20‐25
Prevalence Astigmatism vs. Fits Data
Percentage (%)
20%
Prevalence
Prevalence
20%
Although toric soft CL prescribing increasing ‐ not to levels expected if all astigmats fully corrected
Astigmatic Drop Outs A high percentage of CL drop‐ outs are astigmats 65% of drop‐outs: ≥ 0.75DC in one eye
47 20
Prevalence Toric fits UK ‐ Industry astigmatism (≥0.75D data 2 at least 1 eye) 1
19
Norway 3
Young, Veys, Pritchard & Coleman Ophthal Phsiol Opt 2002; 22: 516‐52
• Astigmats over represented among CL drop‐outs • Poor vision due to uncorrected cylinder contributing factor in CL discontinuation
1. Young G, Sulley A & Hunt C. Prevalence of Astigmatism in Relation to Soft Contact Lens Fitting; Eye & CL, 2011: 37: 20‐25 2. GfK Fit Audit FY 2011 3. 19.4% CL wearers use torics – Internal data, 2012
1