Implementations of image sensor packages may include a plurality of microlenses coupled over a color filter array (CFA), a low refractive index layer directly coupled to and over the plurality of microlenses, an adhesive directly coupled to and over the low refractive index layer, and an optically transmissive cover directly coupled to and over the adhesive. Implementations may include no gap present between the optically transmissive cover and the plurality of microlenses.