A new smartphone app gives a close-up view of a patient's eye. Screengrab from video by Peek Vision, produced in collaboration with Sony Mobile. hide caption

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Our readers wrote in on how they tried to take a vacation from their smartphones. Christian Wheatley/iStockphoto hide caption

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We Asked, You Answered: Going To Extremes To Disconnect On Vacation
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A salesperson demonstrates the Apple iPhone 4 in New Delhi, India. While mobile device use is growing rapidly in emerging markets, Apple's current product line may prove prohibitively expensive for many consumers. Manish Swarup/AP hide caption

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As Developing World Goes Mobile, Can Apple Make The Sale?
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