I am high myopic and have lattice degeneration (no tear). should i be worried about carrying a 15 lb backpack while travelling cross-country by air?

No : Lattice degeneration is a thinning of the peripheral retina from the vitreous gel "pulling" on the retina with whitening of the retinal blood vessels. This forms an oval or round patch of "lattice" white blood vessels and a thinned retina. Lattice can be associated with round retinal holes and tears at the edge-this can result in retinal detachment. Lifting heavy objects and exercise are ok.

No: This should provide no increased in risk to your eyes.

No, but: No. You should not worry especially, but do know that about 7% of patients with lattice will get a retinal detachment at some point in their life. High myopia is another risk factor that adds to your risk. Since you are the adventurous type, you may want to consider laser treatment of the lattice to protect you from potential retinal detachment occurring in an area without proper care.

Continuing: Sorry about previous message ;#40;cut off;#41;. Retinal pigmented epithelial changes happen secondarily and may show atrophy ; clumping. The retinal blood vessels often look sclerotic in areas of lattice. Skin atrophy is generally atrophy of dermal fat, loss of elastic tissue, epidermal changes. Traveling by foot or air should not impose any substantial risk to you. Enjoy.