To make matters worse, they are often poor candidates for transplant surgery the standard keratoconus cure.
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Organisation is often poor, with too many different forces or units, each seeing the others as rivals.
Controls over such devices are often poor, and get poorer still when the devices themselves have outlived their usefulness.
Productivity in the public sector is hard to measure and often poor.
The charities say the lack of a national standard has led to an inconsistent and often poor response to wildlife crime from police.
He said many of the necessary tools, such as antibiotics, had already been developed, but the challenge was using them appropriately in often poor countries.
The origins of the militias lie in the recruitment and arming by the Indonesian army of the often poor and illiterate people of East Timor's mountains.
But keeping these debts on their books, and so continuing to favour existing long-term but often poor-risk customers, is choking off bank credit to those firms which could actually make good use of it.
In many states, Medicaid patients cannot access timely, specialized care (especially on the outpatient side) when they need it because reimbursement has been set so low, and the doctors partaking in the program are often poor.
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On tiny plots, and often poor-quality soil, without modern equipment or farming methods, and sometimes beset by land disputes, many peasant farmers struggle to feed their family and grow just a little extra to sell in the village market.
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Most doctors and nurses continue to work long hours, often in poor conditions for little pay.
But, just as revolutionaries often make poor administrators, Mr Cameron's flexibility may prove helpful to him in government.
The late pontiff would visit Rome parishes, hundreds of them, and often in poor neighborhoods on the city's outskirts, on Sunday mornings.
First of all, ATMs are your friends while bureaux de change are generally your enemies, as their rates are often very poor.
Here, I think the corporation is often a poor crucible for development.
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The models produce projections or scenarios which are no more accurate than the assumptions, algorithms and data , often of poor quality, which were put into them.
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It lies in suggesting that although public money should provide a safety net for the most vulnerable the state has often proved poor at delivering such services.
Brazilians pay too much tax (32% of national income goes to the government, which spends an even larger slice) and too often get poor services in return.
These days British prisoners have access to a far wider range of foods but nevertheless often make poor choices and consume diets that are far from ideal.
With little education and, often, poor English skills, they were stuck in limbo, a world of minimum wage jobs with no chance of security or bettering their lives.
At the bottom of the pyramid the 300, 000 employees who check the tracks and the level crossings were all assigned winter gear such as appropriate shoes and gloves, accessories that they are often too poor to buy on their own.
They would mostly run Android, sport single-core ARM chips, relatively-short battery life (think 4-5 hours), inferior touchscreens (stylus, anyone?), and often a poor selection of apps (subsets of the Google Android Market or, in the case of e-readers, none at all).
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Oswell said wearing flip-flops can be seriously detrimental for people whose feet are already at risk: For people with diabetes, who often have poor circulation and feeling in their feet, wearing flip-flops can expose them not only to injury but to infection.
The fees that credit cards generally add to purchases abroad are often less than you'd pay to get cash at currency-exchange kiosks or hotels, which often have poor exchange rates or high commissions, said Fritz Elmendorf, vice president of the Consumer Bankers Association, a national trade group.
But for all three, the root of poor behaviour often lies in pupil's poor self-esteem.
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The problem is one of delivery: in many poor countries available supplies very often fail to reach the poor.
The National Association of Head Teachers said the responsibility often lay with poor parenting.
NPR's Tovia Smith reports that civil unions are often spurned as poor substitutes for the real thing.
Almost half of pregnant Egyptian women are anaemic, reflecting an iron deficiency often caused by poor diets.
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