Final answer:
A fundus examination is the first recommended investigation for a kid experiencing flashes and floaters to check for serious retinal issues.
Step-by-step explanation:
If a kid is experiencing flashes and floaters, the initial recommendation would typically be to conduct a fundus examination. This type of examination allows the eye care professional to look at the back of the eye, including the retina, optic disc, and the underlying layer of blood vessels that feed the retina (the choroid). The presence of flashes and floaters could indicate posterior vitreous detachment or retinal tear, which require immediate attention to prevent more serious problems such as a retinal detachment. Other options like visual acuity test, intraocular pressure measurement, and slit-lamp examination, are also important in a full eye assessment but are not the primary initial investigation for symptoms such as flashes and floaters.