The experimental new eyedrops combine two existing drugs, carbachol and brimonidine, which work together to temporarily constrict the pupil. This creates a pinhole camera effect. Pinholes do not bend light rays. Instead, they allow only the central light rays to pass through. Since these rays don’t hit the eye at multiple angles, the lens doesn’t need to change its shape. Both distant and near objects remain in focus.
4. With a smaller pupil, the eye admits less light. So the user puts the drops only in one eye. The brain combines the bright, blurry image from one eye with the sharp, dark image from the other to create an image that is both bright and sharp.