What would you do if you had trouble seeing clearly? You would probably go to an eye doctor who might give you glasses. For many people around the world, however, such a way isn't that simple.
The World Health Organization reports that glasses can help one billion people in the world. Yet places like Ghana have only one eye doctor every 8 million people. This makes glasses almost impossible to get. Joshua Silver, a teacher at Oxford University, however，may have solved the problem.
Mr. Silver has developed liquid(液体)-filled glasses that users can adjust(调整) by themselves without seeing a doctor! The lenses(镜片) are filled with oil. Using a dial on the glasses, the user changes the amount of oil. This changes the strength(度数) of the lens. After the user finds the right strength, he then fixes the lens.
Results show that among those who have tried the glasses, around 80% are satisfied. Mr. Silver's goal is for everyone who still needs glasses to have such glasses as soon as possible. With a little more effort, Mr. Silver thinks that his goal might be achieved in the near future.
