A very long penis can cause dispareunia, if the man doesnt understand how to use it carefully. Condom use
One Australian study of 184 men looked at penis length and circumference in relationship to condom breakage or slippage. 3,658 condoms were used. The study found that when used correctly, condoms had a breakage rate of 1.34% and a slippage rate of 2.05%, for a total failure rate of 3.39%. Penile dimensions did not influence slippage, although penis circumference and broken condoms were strongly correlated, with larger sizes increasing the rate of breakage. Biochemistry
Androgens like testosterone are responsible for penis enlargement and elongation during puberty. Penis size is positively correlated with increasing testosterone levels during puberty. But after puberty, administration of testosterone does not affect penis size, and androgen deficiency in adult men only results in a small decrease in size. Growth hormone (GH) and insulin-like growth factor 1 (IGF-1) are also involved in penis size, with deficiency (such as that observed in growth hormone deficiency or Laron syndrome) at critical developmental stages having the potential to result in micropenis. Variance
Grower vs shower
A 2018 study differentiates two types of penises based on the change they experience from flaccid to erect. It distinguishes between growers and showers. Growers or penises of blood grow more than 4 cm with respect to their flaccid state, and showers or penises of meat grow less of 4 cm. Genetics
There are certain genes, like homeobox (Hox a and d) genes, which may have a role in regulating penis size.
Causes of Metamorphopsia
Metamorphopsia can be a symptom of a number of eye disorders involving the retina or macula. Some of these conditions include the following:

Age-related macular degeneration
Epiretinal membrane and vitreomacular traction
Posterior vitreous detachment
Macular hole

Diagnosis
Tests used for diagnosis of Metamorphopsia mostly make use of subjective assessments of how a person views regular patterns. Many of these tests have a poor ability to accurately diagnose or identify a person with the disease (i.e.,poor sensitivity). The use of assessments such as a psychophysical test called preferential hyperacuity perimetry, which assesses a person’s ability to any misalignments of visual objects, may permit a more sensitive diagnosis of Metamorphopsia. Treatment and Prognosis
Metamorphopsia is a symptom of several common retinal and macular diseases, therefore treating the underlying disorder can improve symptoms. For people who have conditions such as Epiretinal membrane (ERM), Macular Holes and Retinal Detachment, decreased metamorphopsia is associated with an increase in visual acuity. Quantitative evaluation of metamorphopsia is an important step in understanding visual functions of individuals with macular disorders and is an essential tool for physicians in evaluating treatment results. Types
Dry (non-exudative, > 80%)—deposition of yellowish extracellular material in and between Bruchs membrane and retinal pigment epithelium (“drusen”) with gradual loss in vision.Wet (exudative, 10–15%)—rapid loss of vision due to bleeding secondary to choroidal neovascularization. Etymology
Gk, meta + morphe, form, opsis, sight

See also
Dysmorphopsia
Hallucination


== References ==