Types of refractive errors | Distribution | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Overall (N=1374) (All percentages under this column calculated with N = 1374) |
Gender Based Distribution | Age based Distribution | |||||||||||||||||||
Males (N =670) (All percentages under this column calculated with N = 670) |
Females (N = 704) (All percentages under this column calculated with N = 704) |
Age ≤ 40 (N =1284) (All percentages under this column calculated with N = 1284) |
Age >40 (N = 90) (All percentages under this column calculated with N = 90) |
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N | % | N | % | N | % | N | % | N | % | N | % | N | % | N | % | N | % | N | % | ||
Astigmatism (Cylinder ≥ 0.50 DC) |
Low to moderate Astigmatism* (≥ 0.50 DC and < 3.00 DC) |
1078 | 78.5% | 949 | 69.1% | 534 | 79.7% | 472 | 77.5% | 544 | 77.3% | 477 | 73.0% | 1017 | 79.2% | 897 | 69.9% | 61 | 67.8% | 52 | 57.8% |
High Astigmatism* (≥ 3.00 DC) |
129 | 9.4% | 62 | 10.2% | 67 | 10.3% | 120 | 9.3% | 9 | 10.0% | |||||||||||
WTR* (+/- 30° on 90°; cylinder ≥ 0.50 DC) |
784 | 57.1% | 354 | 58.1% | 430 | 65.8% | 748 | 58.3% | 36 | 40.0% | |||||||||||
ATR* (+/- 30° on 180°); cylinder ≥ 0.50 DC) |
182 | 13.2% | 117 | 19.2% | 65 | 10.0% | 168 | 13.1% | 14 | 15.6% | |||||||||||
OBL* (120° to 150° and 30° to 60; cylinder ≥ 0.50 DC) |
112 | 8.2% | 63 | 10.3% | 49 | 7.5% | 101 | 7.9% | 11 | 12.2% | |||||||||||
Simple Myopic [plano sphere (> −0.5 D to < +0.5 D) & Cyl (-ve) ≤ −0.5 DC] |
112 | 8.2% | 73 | 12.0% | 39 | 6.0% | 105 | 8.2% | 7 | 7.8% | |||||||||||
Simple Hyperopic [plano sphere (> -0.5 D to < +0.5 D) & Cyl (+ve) ≥ 0.5 DC] |
17 | 1.2% | 12 | 2.0% | 5 | 0.8% | 12 | 0.9% | 5 | 5.6% | |||||||||||
Compound Myopic (sph ≤ −0.5 D & cyl ≤ −0.50 DC) |
895 | 65.1% | 419 | 68.8% | 476 | 72.9% | 850 | 66.2% | 45 | 50.0% | |||||||||||
Compound Hyperopic (sphere of ≥ +0.5 D & cylinder of ≥ +0.50 DC) |
29 | 2.1% | 14 | 2.3% | 15 | 2.3% | 27 | 2.1% | 2 | 2.2% | |||||||||||
Mixed astigmatism^ | 25 | 1.8% | 16 | 2.6% | 9 | 1.4% | 23 | 1.8% | 2 | 2.2% | |||||||||||
No Astigmatism | (Absolute cylinder ≤ 0.50 DC) | 296 | 21.5% | - | - | 136 | 20.3% | - | - | 160 | 22.7% | - | - | 267 | 20.8% | - | - | 29 | 32.2% | - | - |