Related Experiment Video
Updated: Jan 20, 2026

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
Published on: February 10, 2023
[Unusual regressive cataract with petaloid-shaped crystalline core]
Ahmed Bennis1, Idriss Andaloussi Benatiya2
1Centre Hospitalier Hassan II, Faculté de Médecine et de Pharmacie de Fès, Maroc.
Abstract:
We report the case of a 38-year old patient with no previous medical-surgical history, victim of traumatic contusion injury in the right eye resulting from stone blow which occurred 20 years before and experiencing progressive decrease in visual acuity over the last 10 years. Ophthalmologic examination of the right eye showed visual acuity of counting fingers and ocular tone 11 mmHg. Examination of the anterior segment after dilation of the pupil showed regressive cataract with petaloid-shaped crystalline core. The petals had dense edges and sutures. Given the inaccessibility of the ocular fundus and that the examination of the left eye objectified no abnormalities, ocular ultrasound was performed.
Related Concept Videos
Regression Toward the Mean
Unusual Results
According to the range rule of thumb, any value above or below two standard deviations, 2σ from the mean, μ is considered unusual.
Maximum unusual value =...
z Scores and Unusual Values
This score indicates how far a value is from the mean in terms of standard deviation. For example, if a data value has a z score of +1, the researcher can infer that the particular data value is one standard deviation above the mean. If another data...
The Nucleosome Core Particle
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
Multiple Regression
Farmers can use multiple regression to determine the crop yield based on more than one factor, such as water availability, fertilizer, soil properties, etc. Here, the crop yield is the response or dependent variable as it depends on the other independent variables. The analysis requires the construction of a scatter plot...
Correlation and Regression

