hypermetropia

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Related to hypermetropic: regular astigmatism

hypermetropia

[‚hī·pər·mə′trō·pē·ə]
(medicine)
A defect of vision resulting from too short an eyeball so that unaccommodated rays focus behind the retina. Also known as farsightedness; hyperopia.
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In this study, the relationship between refractive error and AMD was investigated in a Turkish population and a strong correlation was found between AMD and the prevalence of hypermetropic refractive error.
This finding is in agreement with previous studies which documented similar results in their study.6,7,16,18 We found that the axial length was longest in the myopic group, followed by the emmetropic and hypermetropic groups.
However, in our case there was a greater number of hypermetropic patients than myopic patients, whilst the results of the World Health Organization were the opposite.
of cases Percentage Astigmatism 150 42.37 Simple hypermetropic astigmatism 56 37.33 Compound hypermetropic astigmatism 14 9.33 Simple myopic astigmatism 50 33.33 Compound myopic astigmatism 22 14.66 Mixed astigmatism 8 5.33 Hypermetropia 76 21.46 Presbyopia 60 16.94 Myopia 44 12.42 Mixed 24 6.77 Table 7: Amount of diaptoric power in various type of astigmatism in headache (n = 150) Type of Astigmatism Astigmatism Astigmatism astigmatism (A) up to 1 D 1.25-2 D >2 D No.
"It will be necessary to investigate as to whether there are differences in the anatomical indexes studied between emmetropic, myopic and hypermetropic eyes, and between populations of different ethnic origin" the researcher concluded.
Hypermetropic refractive error was responsible for amblyopia in 31(77.5%) eyes, the range of error being +1.50D to +8.00 D.
Evaluation of the association between contrast sensitivity and spherical equivalent at low refractive errors revealed that contrast sensitivity was decreased at intermediate and especially at high spatial frequencies as refraction became hypermetropic (p<0.01).
It is well known that term infants are commonly hypermetropic, while preterm infants are always associated with myopia [4-7].
The mean increase in lens thickness and decrease in ACD during accommodation were also found to be maximum in myopic patients and minimum in hypermetropic patients, which were also linearly correlated with the AA.
Table 1: Age wise Stratification of Refractive Status Simple Simple Myopic Hypermetropic Parameter Myopia Hypermetropia Astigmatism Astigmatism 5-10 Years 7 12 3 1 Row% 22% 38% 9% 3% Col% 70% 60% 75% 100% 11-15 Years 3 8 1 0 Row% 17% 44% 5% 0% Col% 30% 40% 25% 0% Total 10 20 4 1 Row% 20% 40% 8% 2% Col% 100% 100% 100% 100% Parameter Esotropia Exotropia Total 5-10 Years 3 6 32 Row% 9% 19% 100% Col% 60% 60% 64% 11-15 Years 2 4 18 Row% 11% 22% 100% Col% 40% 40% 36% Total 5 10 50 Row% 10% 20% 100% Col% 100% 100% 100% Table 2: Status after 3 months Post-occlusion Therapy in different Age Groups Post Occlusion Therapy--Third Month Age Improved Not Improved Total 5-10 Yrs.
However this can be due to significantly higher mean age in hypermetropic group than myopes (Table-I) and studies have shown that HOAs increase with age.5,17-19 Marcos et al,10 reported that RMS of wavefront aberrations in high myopia (greater than 6.0 D) has statistically significant positive correlation with refractive error.